Tablets, Oral, >= 15 mg, weekly, 1 year

IV solution, Intravenous, D5W, Day 1, Day 15, Day 29; every 28 days thereafter, 1 year

Marked abnormality criteria are: Hemoglobin (HGB): >3 g/dL decrease from BL; Hematocrit: <0.75 * BL; Erythrocytes: <0.75 * BL; Platelets (PLT): <0.67 * LLN/>1.5 * ULN, or if BL < LLN then use <0.5 * BL and <100,000 mm^3; Leukocytes: <0.75 * LLN/ >1.25 * ULN, or if BL<LLN then use <0.8 * BL or >ULN, or if BL>ULN then use >1.2 * BL or <LLN; neutrophils+bands: <1.0 * 10^3 c/uL; eosinophils: >0.750 * 10^3 c/uL; basophils: > 400 mm^3; monocytes: >2000 mm^3; lymphocytes: <0.750 * 10^3 c/uL/ >7.50 * 10^3 c/uL.

Marked abnormality criteria are: Hemoglobin (HGB): >3 g/dL decrease from BL; Hematocrit: <0.75 * BL; Erythrocytes: <0.75 * BL; Platelets (PLT): <0.67 * LLN/>1.5 * ULN, or if BL < LLN then use <0.5 * BL and <100,000 mm^3; Leukocytes: <0.75 * LLN/ >1.25 * ULN, or if BL<LLN then use <0.8 * BL or >ULN, or if BL>ULN then use >1.2 * BL or <LLN; neutrophils+bands: <1.0 * 10^3 c/uL; eosinophils: >0.750 * 10^3 c/uL; basophils: > 400 mm^3; monocytes: >2000 mm^3; lymphocytes: <0.750 * 10^3 c/uL/ >7.50 * 10^3 c/uL.

Sodium < 0.9 * LLN or > 1.05 * ULN or if BL < LLN then use < 0.95 * BL or > ULN or if BL > ULN then use >1.05 *BL or < LLN; Potassium: < 0.9 * LLN or > 1.1 * ULN or if BL < LLN then use < 0.9 * BL or > ULN or if BL > ULN then use 1.1 * BL or < LLN; Chloride: < 0.9 * LLN or > 1.1 * ULN or if BL < LLN then use <0.9 * BL or >ULN or if BL > ULN then use > 1.1 * BL or < LLN; Calcium <0.8 * LLN or > 1.2 * ULN or if BL < LLN then use <0.67 * BL or > ULN or if BL > ULN then use > 1.3 * BL or < LLN.

Glucose: < 65 mg/dL or > 220 mg/dL; Fasting Glucose: <0.8 * LLN or > 1.5 * ULN or if BL < LLN then use < 0.8 * BL or > ULN or if BL > ULN then use 1.1 * BL or < LLN; Total protein: < 0.9 * LLN or 1.1 * ULN or if BL < LLN then use 0.9 * BL or > ULN or if BL > ULN then use 1.1 * BL or < LLN; Albumin: < 0.9 * LLN or if BL < LLN then use 0.75 * BL; Uric acid: > 1.5 * ULN or if BL > ULN then use > 2.0 * BL. All urinalysis abnormalities were defined as: if missing BL then use >= 2 or if value >=4, or if BL = 0 or 0.5 then use >= 2, or if BL = 1.0 then use >= 3, or if BL = 2.0 then use >=4.

Mean baseline values are those that are reported for each cohort at each time point on Day 365, Day 729, and Day 1,093.

Participants with titers to abatacept in the DB and OL periods. Serum samples from abatacept-treated adult participants with active Rheumatoid Arthritis (RA) were screened for the presence of drug-specific antibodies using two validated direct-format enzyme-linked immunosorbent assays (ELISAs) to determine the presence of antibodies to abatacept and or CTLA4-T.

Vital signs included body temperature, heart rate, and seated blood pressure. Clinically significant changes were defined as those that were not within the normal range for the participant.

AEs were defined as any new untoward medical occurrence or worsening of a pre- existing medical condition which does not necessarily have a causal relationship with this treatment. AEs of special interest have been identified to be those which may be associated with the use of immunomodulatory agents or infusion of therapeutic proteins. Acute infusional AEs were defined as those that occurred within 1 hour after the start of the infusion.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

Mean baseline values are those that are reported for each cohort at each time point on Day 365 to Day 2,185.

All changes in participant laboratory parameters were monitored on each day of study drug administration.

This analysis determined whether participants in the OL period were RF positive or RF negative based on serum samples. A positive value for RF was > 20 IU/ml; a negative value for RF was ≤ 20 IU/mL.

ACR 20 response requires a patient to have a 20% reduction in the number of swollen and tender joints, and a reduction of 20% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score. A participant achieved a sustained ACR 20 response if the participant had ACR 20 observed for at least 2 consecutive study visits.

ACR 20 response requires a patient to have a 20% reduction in the number of swollen and tender joints, and a reduction of 20% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

ACR 50 response requires a patient to have a 50% reduction in the number of swollen and tender joints, and a reduction of 50% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score. A participant achieved a sustained ACR 50 response if the participant had ACR 50 observed for at least 2 consecutive study visits.

ACR 50 response requires a patient to have a 50% reduction in the number of swollen and tender joints, and a reduction of 50% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

ACR 50 response requires a patient to have a 50% reduction in the number of swollen and tender joints, and a reduction of 50% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score. A participant achieved a sustained ACR 50 response if the participant had ACR 50 observed for at least 2 consecutive study visits.

ACR 70 response requires a patient to have a 70% reduction in the number of swollen and tender joints, and a reduction of 70% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

ACR 70 response requires a patient to have a 70% reduction in the number of swollen and tender joints, and a reduction of 70% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

ACR 70 response requires a patient to have a 70% reduction in the number of swollen and tender joints, and a reduction of 70% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

A Major Clinical Response (MCR) is defined as maintenance of an ACR 70 response over a continuous 6-month period.

The DAS 28 is an assessment of disease activity measured on a visual analog scale (VAS)of 100 mm. The scale reports from 1 to 10, with increasing number indicating increasing extent of disease progression. Scores for disease activity are defined as high (>5.1); low (≤3.2); remission (<2.6). Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

AE was defined as any new untoward medical occurrence or worsening of a pre-existing medical condition which does not necessarily have a causal relationship with this treatment. SAE was defined as any untoward medical occurrence that at any dose: results in death, is life-threatening, requires inpatient hospitalization or causes prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect, results in development of drug dependency or drug abuse, is an important medical event.

To assess joint damage progression, the Genant-modified Sharp scoring method was used to evaluate radiographs of hands/wrists and feet for erosions and joint space narrowing (JSN). The total Genant-modified Sharp score ranges from 0 (no radiographic damage) to 290 (worst possible radiographic damage) and is the sum of the erosion score (range 0-145) and the joint space narrowing score (range 0-145). Higher scores indicated more damage. Change from baseline = Post-baseline - Baseline value.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

An extended major clinical response (MCR) was defined as a continuous ACR 70 response over any nine month treatment period with study medications. ACR 70 response criteria requires a patient to have a 70% reduction in the number of swollen and tender joints, and a reduction of 70% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, C-reactive protein or erythrocyte sedimentation rate, and degree of disability in HAQ score.

The mean baseline CRP and ESR in the DB period on Day 169 and Day 365 was evaluated for all treated participants. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean change from baseline in CRP and ESR in the DB period was evaluated for all treated participants. Adjustment based on ANCOVA model with treatment as factor and baseline value as covariate.

The mean baseline sIL2-r in the DB period was evaluated from serum samples for all treated participants.

The mean change from baseline in sIL2-r in the DB period was evaluated for all treated participants.

Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean number of swollen joints in the DB period was evaluated based on the swollen joint core component of the ACR scoring system where increasing score indicates increasing level of severity. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

Participant self-reported pain assessment core component of the ACR scoring system where increasing score indicates increasing level of severity as indicated on a 100mm Visual Analog Scale (VAS) with 0mm representing no pain and 100mm representing the most pain possible.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

Participant self-reported global RA assessment core component of the ACR scoring system where increasing score indicates increasing level of severity as indicated on a 100mm Visual Analog Scale (VAS) with 0mm representing no pain and 100mm representing the most pain possible.

Physician global RA assessment core component of the ACR scoring system where increasing score indicates increasing level of severity as indicated on a 100mm Visual Analog Scale (VAS) with 0mm representing very good global RA assessment and 100mm representing very poor global RA assessment.

CRP core component of the ACR scoring system was evaluated from serum samples in which increasing levels indicate increasing level of disease.

Participants that discontinued treatment during the DB period for any reason were evaluated after 6 months and 1 year of treatment.

To assess joint damage progression, the Genant-modified Sharp scoring method was used to evaluate radiographs of hands/wrists and feet for erosions and joint space narrowing (JSN). The total Genant-modified Sharp score ranges from 0 (no radiographic damage) to 290 (worst possible radiographic damage) and is the sum of the erosion score (range 0-145) and the joint space narrowing score (range 0-145). Higher scores indicated more damage. Improvement=decreases from BL, stable=same as BL, worsening=increases from BL.

All changes in participant vital signs were monitored on each day of study drug administration prior to dosing and 60 minutes after dosing. Vital signs included body temperature, heart rate, and seated blood pressure. Clinical significance was defined as any change from baseline that resulted in a value outside the normal limits for the participant.

AEs were defined as any new untoward medical occurrence or worsening of a pre- existing medical condition which does not necessarily have a causal relationship with this treatment. AEs were identified as those which may be associated with the use of immunomodulatory agents or infusion of therapeutic proteins. Acute infusional AEs were defined as those that occurred within 1 hour after the start of the infusion.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

Participants with titers to abatacept in the DB period. Serum samples from abatacept-treated adult participants with active RA were screened for the presence of drug-specific antibodies using two validated direct-format enzyme-linked immunosorbent assays (ELISAs) to determine the presence of antibodies to abatacept and/or CTLA4-T.

Tender joints and swollen joints are core components of the ACR 20, 50, and 70. The incidences of new tender joints and new swollen joints were evaluated in the DB period after 6 months and 1 year of treatment.

Marked abnormality criteria were: Hemoglobin (HGB): >3 g/dL decrease from BL; Hematocrit: <0.75 * BL; Erythrocytes: <0.75 * BL; Platelets (PLT): <0.67 * LLN/>1.5 * ULN, or if BL < LLN then use <0.5 * BL and <100,000 mm^3; Leukocytes: <0.75 * LLN/ >1.25 * ULN, or if BL<LLN then use <0.8 * BL or >ULN, or if BL>ULN then use >1.2 * BL or <LLN; neutrophils+bands: <1.0 * 10^3 c/uL; eosinophils: >0.750 * 10^3 c/uL; basophils: > 400 mm^3; monocytes: >2000 mm^3; lymphocytes: <0.750 * 10^3 c/uL/ >7.50 * 10^3 c/uL.

Marked abnormality criteria were: Aspartate Aminotransferase (AST) >3 * ULN or if BL > ULN then use >4 *BL; Alanine Aminotransferase (ALT) >3 * ULN or if BL > ULN then use > 4 * BL; Creatinine > 1.5 * BL.

Mean baseline values are reported for each cohort at each time point.

Serum samples were evaluated from study participants to determine the mean change from baseline in ESR values.

This analysis determined participant RF status (positive or RF negative) based on serum samples at each specified timepoint. A positive value for RF was > 20 IU/ml; a negative value for RF was ≤ 20 IU/mL.

ACR 20 response requires a patient to have a 20% reduction in the number of swollen and tender joints, and a reduction of 20% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, CRP or ESR, and degree of disability in HAQ score. A participant achieved a sustained ACR 20 response if the participant had ACR 20 observed for at least 2 consecutive study visits.

ACR 50 response requires a patient to have a 50% reduction in the number of swollen and tender joints, and a reduction of 50% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, CRP or ESR, and degree of disability in HAQ score.

ACR 70 response requires a patient to have a 70% reduction in the number of swollen and tender joints, and a reduction of 70% in three of the following five parameters: physician global assessment of disease, patient global assessment of disease, patient assessment of pain, CRP or ESR, and degree of disability in HAQ score. A participant achieved a sustained ACR 70 response if the participant had ACR 70 observed for at least 2 consecutive study visits.

The DAS 28 is a continuous measure evaluating extent of disease activity in RA, and is a composite of 4 variables: the 28 tender joint count, the 28 swollen joint count, erythrocyte sedimentation rate (ESR) and participant assessment of disease activity measure on a visual analog scale (VAS) of 100 mm. The scale reports from 1 to 10, with increasing number indicating increasing extent of disease progression. Scores for disease activity are defined as high (> 5.1); low (≤ 3.2); remission (< 2.6).

Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

Change from baseline in participant were calculated at all study visits in the DB and OL periods.

Mean baseline values are reported for each cohort at each time point. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

Change from baseline in participant serum values of ESR were calculated at all study visits in the OL period.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

Change from baseline in the Genant-modified Sharp erosion score, JSN, TS were evaluated for all participants at the end of the OL period. The total Genant-modified Sharp score (TS) ranges from 0 (no radiographic damage) to 290 (worst possible radiographic damage) and is the sum of the erosion score (range 0-145) and the joint space narrowing score (range 0-145).Higher scores indicated more damage. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The SF-36 covers 8 health dimensions including 4 physical subscales (physical function, role-physical, bodily pain, and general health) and 4 mental subscales (vitality, social function, role-emotional, and mental health). All subscales were scored using norm-based methods that standardized the scores to a mean of 50 and a standard deviation of 10 in the general population. The scores range from a minimum of 0 to a maximum of 100, with a higher score indicating better quality of life. Improvements of > 3 points were considered clinically meaningful.

Mean baseline values are reported for each cohort at each time point using the VAS 100 mm where 0= no fatigue to 100 = the worst fatigue imaginable. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean change from baseline in fatigue was measured on the VAS 100 mm where 0= no fatigue to 100 = the worst fatigue imaginable.

Mean baseline values are reported for each cohort at each time point using the Medical Outcomes Study Sleep scale (MOS-sleep [assesses the extent of sleep problems and measures six dimensions of sleep on a 12-item participant-reported measure]). An overall Sleep Problems Index (SPI) was generated as a summary measure of different types of sleep problems (sleep disturbance, sleep quantity, sleep adequacy, etc.). The score ranges from 0 to 100, with 0 = no problems with sleep and 100 = the most severe problems with sleep. The mean score of the SPI in a population with chronic conditions is 29.

The mean change from baseline in sleep quality was assessed on the Medical Outcomes Study Sleep scale (MOS-sleep [assesses the extent of sleep problems and measures six dimensions of sleep on a 12-item participant-reported measure]). An overall Sleep Problems Index (SPI) was generated as a summary measure of different types of sleep problems (sleep disturbance, sleep quantity, sleep adequacy, etc.). The score ranges from 0 to 100, with 0 = no problems with sleep and 100 = the most severe problems with sleep. The mean score of the SPI in a population with chronic conditions is 29.

Mean baseline values are reported for each cohort at each time point. Activity limitation was measured by the number of days in the past 30 days a participant was unable to perform usual activities due to RA. Time-matched BL (Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean change from baseline in limitations on activities of daily living in the OL period. Activity limitation was measured by the number of days in the past 30 days a participant was unable to perform usual activities due to RA.

Mean baseline values are reported for each cohort at each time point. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean change from baseline in potential biomarkers of disease (IL-6, SIL-3R, and TNF-Alpha were determined for all participants.

The mean change from baseline in participant rheumatoid factor was determined after 6 months and 1 year of treatment relative to baseline. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

Mean baseline values are reported for each cohort at each time point. Time-matched BL(Day 0) values and post-BL vales were presented for each post-BL visit and represent only that cohort of participants with measurements available at that post-BL assessment.

The mean change from basline in particpant biomarkers of RA disease (E-Selectin, SICAM-1, and MMP3) after 6 months and 1 year of treatment, relative to baseline, were evaluated.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

The HAQ-DI includes 20 questions to assess physical function in 8 domains: dressing, arising, eating, walking, hygiene, reach, grip, and common activities. The domain questions are evaluated on a 4-point scale: 0=without any difficulty, 1=with some difficulty, 2=with much difficulty, 3=unable to do. HAQ-DI=sum of worst scores in each domain dividied by the number of domains answered. HAQ-DI ranges from 0 to a maximum overall score of 3.0. Clinically meaningful HAQ response was defined as an improvement of at least 0.3 units from baseline in HAQ DI.

Control group receiving MTX treatment in combination with placebo. Participants received MTX at a minimum dose of (10-30 mg/wk), although doses of < 10 mg/wk were acceptable if due to toxicity. Placebo was administered IV on Days 1, 15, 29, 57, 85, 113, 141, 169, 197, 225, 253, 281, 309, and 337.

Abatacept was dosed intravenously by weight at 10 mg/kg in the OL period under tiered dosing such that participants weighing < 60 kg received abatacept 500 mg; participants ≥ 60 kg and ≤ 100 kg received abatacept 750 mg; and participants > 100 kg received abatacept 1 g. MTX was continued at the dose used in the DB period.