ASAS recommended NSAID doses to treat axial spondyloarthritis.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

The ASAS HI measures functioning and health across 17 aspects of health in patients with AS, including pain, emotional functions, sleep, sexual function, mobility, self care, and community life. The ASAS HI consists of 17 questions, each answered by the participant as agree (1) or disagree (0). The responses to the 17 dichotomous items are summed up to give a total score ranging from 0 to 17, with a lower score indicating a better and a higher score indicating an inferior health status.

The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) assesses disease activity by asking the participant to answer 6 questions (each on a 10 point numeric rating scale [NRS]) pertaining to symptoms experienced for the past week. For 5 questions (level of fatigue/tiredness, level of AS neck, back or hip pain, level of pain/swelling in joints, other than neck, back or hips, level of discomfort from any areas tender to touch or pressure, and level of morning stiffness), the response is from 0 (none) to 10 (very severe); for Question 6 (duration of morning stiffness), the response is from 0 (0 hours) to 10 (≥ 2 hours). The overall BASDAI score ranges from 0 to 10 where lower scores indicate less disease activity.

The BASDAI assesses disease activity by asking the participant to answer 6 questions (each on a 10 point numeric rating scale [NRS]) pertaining to symptoms experienced for the past week. For 5 questions (level of fatigue/tiredness, level of AS neck, back or hip pain, level of pain/swelling in joints, other than neck, back or hips, level of discomfort from any areas tender to touch or pressure, and level of morning stiffness), the response is from 0 (none) to 10 (very severe); for Question 6 (duration of morning stiffness), the response is from 0 (0 hours) to 10 (≥ 2 hours). The overall BASDAI score ranges from 0 to 10. Lower scores indicate less disease activity.

A BASDAI 50 response is defined as improvement of 50% or more from baseline in BASDAI score.

The Bath Ankylosing Spondylitis Functional Index (BASFI) is a validated index to determine the degree of functional limitation in patients with AS. BASFI consists of 10 questions assessing participants' ability to perform activities, on a numeric rating scale (NRS) ranging from 0 (easy to perform an activity) to 10 (impossible to perform an activity). The overall score is the mean of the 10 items and ranges from 0 (best) to 10 (worst).

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." Change from baseline in ASDAS calculated using CRP is reported.

ASDAS Major Improvement is defined as a change from baseline ≤ -2.0. ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with major improvement in ASDAS calculated using CRP is reported.

ASDAS clinically important improvement is defined as a change from baseline ≤ -1.1.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with clinically important improvement in ASDAS calculated using CRP is reported.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS inactive disease (defined as ASDAS < 1.3) calculated using CRP is reported.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS low disease activity (defined as ASDAS < 2.1) calculated using CRP is reported.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS moderate disease activity (defined as an ASDAS ≥ 1.3 to < 2.1) calculated using CRP is reported.

ASDAS high disease activity is defined as an ASDAS ≥ 2.1 to < 3.5. ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with high disease activity (defined as an ASDAS ≥ 2.1 to < 3.5) calculated using CRP is reported.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with very high disease activity (defined as an ASDAS > 3.5) calculated using CRP is reported

ASAS20 response was defined as improvement of ≥ 20% relative to baseline and absolute improvement of ≥ 1 unit (on a scale from 0 to 10) in ≥ 3 of the following 4 domains with no deterioration (defined as a worsening of ≥ 20% and a net worsening of ≥ 1 unit) in the potential remaining domain:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

ASAS40 response was defined as improvement of ≥ 40% relative to baseline and absolute improvement of ≥ 2 units (on a scale from 0 to 10) in ≥ 3 of the following 4 domains with no deterioration in the potential remaining domain:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

ASAS partial remission is defined as an absolute score of ≤ 2 units on a 0 to 10 scale for each of the four following domains:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

Active inflammation of the sacroiliac (SI) joints as well as the cervical, thoracic and lumbar regions of the spine was assessed using magnetic resonance imaging (MRI). Images were scored by a central reader according to the Berlin MRI Score on a grading scale from 0 to 3, where Grade 0 indicates no active inflammation and Grade 3 indicates > 66% inflammation of the sacroiliac joints or > 50% active inflammation in the spine.

The Physician's Global Assessment of Disease Activity was assessed using an NRS from 0 (no disease activity) to 10 (severe disease activity).

The Patient's Global Assessment of Disease Activity was assessed using an NRS from 0 (no disease activity) to 10 (very severe disease activity).

The Patient's Global Assessment of Pain was assessed on a NRS from 0 (no pain) to 10 (pain as bad as it could be).

An assessment of 66 joints was performed by physical examination of each joint. The swollen joint count is the number of joints assessed as swollen (0 to 66).

An assessment of 68 joints was performed by physical examination of each joint. The tender joint count is the number of joints assessed as tender (0 to 68).

The Maastricht Ankylosing Spondylitis Enthesitis Score quantitates inflammation of the entheses (enthesitis) by assessing pain at 13 entheses (sites where tendons or ligaments insert into the bone). All sites were scored as 0 (absent) or 1 (present). The MASES is the sum of all site scores (from 0 to 13).

Dactylitis is characterized by swelling of the entire finger or toe. Each digit on the hands and feet was rated as 0 for no dactylitis or 1 for dactylitis present. The dactylitis count, ranging from 0 to 20, is the total number of digits on the hands and feet with dactylitis present.

Erythrocyte sedimentation rate measures the rate of fall (sedimentation) of erythrocytes (red blood cells) in a sample of blood that has been placed into a tall, thin, vertical tube as an indirect measure of the degree of inflammation present in the body.

CRP is an acute phase reactant is a blood test marker for inflammation in the body. CRP levels rise in response to inflammation.

The linear Bath Ankylosing Spondylitis Metrology Index (BASMIlin) is a composite score based on 5 direct measurements of spinal mobility: lateral lumbar flexion, tragus-to-wall distance, lumbar flexion, intermalleolar distance, and cervical rotation angle. The total score ranges from 0 to 10, where higher scores indicate more limited mobility.

Anterior uveitis is an inflammation of the middle layer of the eye. which includes the iris (colored part of the eye) and the adjacent tissue, known as the ciliary body.

Participants received treatment as prescribed by their physician according to the local standard of care.

Total of all reporting groups

Race and Ethnicity were not collected from any participant.

Participants received treatment as prescribed by their physician according to the local standard of care.

The EQ-5D-3L is a health state utility instrument that evaluates preference for health status (utility). The 5 items in the EQ-5D-3L comprise 5 dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression) each of which are rated on 3 levels of severity (1: indicating no problem, 2: indicating some/moderate problems, 3: indicating extreme problems). A single preference-weighted health utility index score was calculated by applying country-specific weights, with scores ranging from approximately 0 (death) to 1 (full health).

Participants with available data at baseline and at each time point

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

Participants who were employed and with available data at baseline and each time point.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

Participants who were employed and with available data at baseline and each time point.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

Participants who were employed and with available data at baseline and each time point.

The Work Productivity and Activity Impairment (WPAI) axSpA is an axSpA specific questionnaire consisting of 6 questions, based on patient recall of the previous 7 days. WPAI assesses work time missed due to illness (absenteeism), impairment at work due to health (presenteeism), overall work impairment due to health (an aggregate measure of both absenteeism and presenteeism), and total non-occupational activity impairment due to health. WPAI scores are expressed as impairment percentages, with higher scores indicating worse outcomes. A negative change from baseline indicates improvement.

Participants with available data at baseline and each time point.

The ASAS HI measures functioning and health across 17 aspects of health in patients with AS, including pain, emotional functions, sleep, sexual function, mobility, self care, and community life. The ASAS HI consists of 17 questions, each answered by the participant as agree (1) or disagree (0). The responses to the 17 dichotomous items are summed up to give a total score ranging from 0 to 17, with a lower score indicating a better and a higher score indicating an inferior health status.

Participants with available data at baseline and each time point

The Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) assesses disease activity by asking the participant to answer 6 questions (each on a 10 point numeric rating scale [NRS]) pertaining to symptoms experienced for the past week. For 5 questions (level of fatigue/tiredness, level of AS neck, back or hip pain, level of pain/swelling in joints, other than neck, back or hips, level of discomfort from any areas tender to touch or pressure, and level of morning stiffness), the response is from 0 (none) to 10 (very severe); for Question 6 (duration of morning stiffness), the response is from 0 (0 hours) to 10 (≥ 2 hours). The overall BASDAI score ranges from 0 to 10 where lower scores indicate less disease activity.

Participants with available data at baseline and each time point

The BASDAI assesses disease activity by asking the participant to answer 6 questions (each on a 10 point numeric rating scale [NRS]) pertaining to symptoms experienced for the past week. For 5 questions (level of fatigue/tiredness, level of AS neck, back or hip pain, level of pain/swelling in joints, other than neck, back or hips, level of discomfort from any areas tender to touch or pressure, and level of morning stiffness), the response is from 0 (none) to 10 (very severe); for Question 6 (duration of morning stiffness), the response is from 0 (0 hours) to 10 (≥ 2 hours). The overall BASDAI score ranges from 0 to 10. Lower scores indicate less disease activity.

A BASDAI 50 response is defined as improvement of 50% or more from baseline in BASDAI score.

Participants with available data at baseline and each time point

The Bath Ankylosing Spondylitis Functional Index (BASFI) is a validated index to determine the degree of functional limitation in patients with AS. BASFI consists of 10 questions assessing participants' ability to perform activities, on a numeric rating scale (NRS) ranging from 0 (easy to perform an activity) to 10 (impossible to perform an activity). The overall score is the mean of the 10 items and ranges from 0 (best) to 10 (worst).

Participants with available data at baseline and each time point

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." Change from baseline in ASDAS calculated using CRP is reported.

Participants with available data at baseline and each time point

ASDAS Major Improvement is defined as a change from baseline ≤ -2.0. ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with major improvement in ASDAS calculated using CRP is reported.

Participants with available data at baseline and each time point

ASDAS clinically important improvement is defined as a change from baseline ≤ -1.1.

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with clinically important improvement in ASDAS calculated using CRP is reported.

Participants with available data at baseline and each time point

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS inactive disease (defined as ASDAS < 1.3) calculated using CRP is reported.

Participants with available data at week 52

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS low disease activity (defined as ASDAS < 2.1) calculated using CRP is reported.

Participants with available data at each time point

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with ASDAS moderate disease activity (defined as an ASDAS ≥ 1.3 to < 2.1) calculated using CRP is reported.

Participants with available data at each time point

ASDAS high disease activity is defined as an ASDAS ≥ 2.1 to < 3.5. ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with high disease activity (defined as an ASDAS ≥ 2.1 to < 3.5) calculated using CRP is reported.

Participants with available data at each time point

ASDAS is a composite disease activity outcome measure which combines patient reported back pain, duration of morning stiffness, patient global assessment of disease activity, patient assessment of peripheral joint pain and swelling and an acute phase reactant (CRP or ESR) as an objective measure of inflammation. The overall score ranges from 0 with no defined upper score; published ranges for disease activity states as defined by the ASDAS are: < 1.3 for "inactive disease"; ≥ 1.3 to < 2.1 for "moderate disease activity"; ≥ 2.1 to ≤ 3.5 for "high disease activity" and > 3.5 for "very high disease activity." The percentage of participants with very high disease activity (defined as an ASDAS > 3.5) calculated using CRP is reported

Participants with available data at each time point

ASAS20 response was defined as improvement of ≥ 20% relative to baseline and absolute improvement of ≥ 1 unit (on a scale from 0 to 10) in ≥ 3 of the following 4 domains with no deterioration (defined as a worsening of ≥ 20% and a net worsening of ≥ 1 unit) in the potential remaining domain:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

Participants with available data at baseline and each time point

ASAS40 response was defined as improvement of ≥ 40% relative to baseline and absolute improvement of ≥ 2 units (on a scale from 0 to 10) in ≥ 3 of the following 4 domains with no deterioration in the potential remaining domain:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

Participants with available data at baseline and each time point

ASAS partial remission is defined as an absolute score of ≤ 2 units on a 0 to 10 scale for each of the four following domains:

• Patient's Global Assessment of disease activity, measured on a numeric rating scale (NRS) from 0 (none) to 10 (severe);
• Pain, measured by the total back pain NRS from 0 (no pain) to 10 (most severe);
• Function, measured by the Bath Ankylosing Spondylitis Functional Index (BASFI) which consists of 10 items assessing participants' ability to perform activities on an NRS ranging from 0 (easy) to 10 (impossible);
• Inflammation, measured by the mean of the 2 morning stiffness-related Bath AS Disease Activity Index (BASDAI) NRS scores (items 5 [level of stiffness] and 6 [duration of stiffness]) each on a scale from 0 (none/0 hours) to 10 (very severe/2 hours or more duration).

Participants with available data at each time point

Active inflammation of the sacroiliac (SI) joints as well as the cervical, thoracic and lumbar regions of the spine was assessed using magnetic resonance imaging (MRI). Images were scored by a central reader according to the Berlin MRI Score on a grading scale from 0 to 3, where Grade 0 indicates no active inflammation and Grade 3 indicates > 66% inflammation of the sacroiliac joints or > 50% active inflammation in the spine.

The study terminated early due to slow enrollment and no data were collected.

The Physician's Global Assessment of Disease Activity was assessed using an NRS from 0 (no disease activity) to 10 (severe disease activity).

Participants with available data at baseline and each time point

The Patient's Global Assessment of Disease Activity was assessed using an NRS from 0 (no disease activity) to 10 (very severe disease activity).

Participants with available data at baseline and each time point

The Patient's Global Assessment of Pain was assessed on a NRS from 0 (no pain) to 10 (pain as bad as it could be).

Participants with available data at baseline and each time point

An assessment of 66 joints was performed by physical examination of each joint. The swollen joint count is the number of joints assessed as swollen (0 to 66).

Participants with available data at baseline and each time point

An assessment of 68 joints was performed by physical examination of each joint. The tender joint count is the number of joints assessed as tender (0 to 68).

Participants with available data at baseline and each time point

The Maastricht Ankylosing Spondylitis Enthesitis Score quantitates inflammation of the entheses (enthesitis) by assessing pain at 13 entheses (sites where tendons or ligaments insert into the bone). All sites were scored as 0 (absent) or 1 (present). The MASES is the sum of all site scores (from 0 to 13).

Participants with available data at baseline and each time point

Dactylitis is characterized by swelling of the entire finger or toe. Each digit on the hands and feet was rated as 0 for no dactylitis or 1 for dactylitis present. The dactylitis count, ranging from 0 to 20, is the total number of digits on the hands and feet with dactylitis present.

Participants with available data at baseline and each time point

Erythrocyte sedimentation rate measures the rate of fall (sedimentation) of erythrocytes (red blood cells) in a sample of blood that has been placed into a tall, thin, vertical tube as an indirect measure of the degree of inflammation present in the body.

Participants with available data at baseline and each time point

CRP is an acute phase reactant is a blood test marker for inflammation in the body. CRP levels rise in response to inflammation.

Participants with available data at baseline and each time point

The linear Bath Ankylosing Spondylitis Metrology Index (BASMIlin) is a composite score based on 5 direct measurements of spinal mobility: lateral lumbar flexion, tragus-to-wall distance, lumbar flexion, intermalleolar distance, and cervical rotation angle. The total score ranges from 0 to 10, where higher scores indicate more limited mobility.

Participants with available data at baseline and each time point

Anterior uveitis is an inflammation of the middle layer of the eye. which includes the iris (colored part of the eye) and the adjacent tissue, known as the ciliary body.

Participants initially received treatment with any non-steroidal anti-inflammatory drug (NSAID) at full anti-inflammatory dose for 4 weeks. After 4 weeks, if the Ankylosing Spondylitis Disease Activity Score (ASDAS) was ≥ 2.1 or treatment with NSAID 1 was not tolerated, treatment was changed to a second NSAID at full anti-inflammatory dose for 4 weeks. If ASDAS was ≥ 2.1 after 4 weeks of NSAID 2, participants were switched to receive a combination of NSAID and adalimumab 40 mg every other week for up to 48 weeks.