ACR20 response criteria were: >=20% improvement in tender joint count; >=20% improvement in swollen joint count; and >=20% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 520 visit. Analysis used observed data (no imputation).

ACR20 response criteria were: >=20% improvement in tender joint count; >=20% improvement in swollen joint count; and >=20% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 260 visit. Analysis used observed data (no imputation).

ACR50 response criteria were: >=50% improvement in tender joint count; >=50% improvement in swollen joint count; and >=50% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 520 visit. Analysis used observed data (no imputation).

Adverse events were collected during the course of the study (after the first adalimumab injection in this continuation study DE020 through 70 days after the last adalimumab injection) for all participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set). The number of participants experiencing any adverse event (serious and non-serious) are summarized. See the Reported Adverse Events section for details.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set).

ACR50 response criteria were: >=50% improvement in tender joint count; >=50% improvement in swollen joint count; and >=50% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 260 visit. Analysis used observed data (no imputation).

ACR70 response criteria were: >=70% improvement in tender joint count; >=70% improvement in swollen joint count; and >=70% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 520 visit. Analysis used observed data (no imputation).

ACR70 response criteria were: >=70% improvement in tender joint count; >=70% improvement in swollen joint count; and >=70% improvement in at least 3 of the 5 remaining ACR core measures: patient assessment of pain; patient global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the Health Assessment Questionnaire [HAQ]); and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response). All improvements were assessed relative to the baseline of the prior study.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 260 visit. Analysis used observed data (no imputation).

Clinical remission on modified Disease Activity Score (DAS28) was a value <2.6; >=2.6 to <=3.2 indicated low disease activity; >3.2 to <=5.1 indicated moderate disease activity; and >5.1 indicated high disease activity. DAS28 score is calculated using the number of tender joints and swollen joints (out of 28 each), patient global assessment of disease activity, and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response).

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 520 visit. Analysis used observed data (no imputation).

Clinical remission on modified Disease Activity Score (DAS28) was a value <2.6; >=2.6 to <=3.2 indicated low disease activity; >3.2 to <=5.1 indicated moderate disease activity; and >5.1 indicated high disease activity. DAS28 score is calculated using the number of tender joints and swollen joints (out of 28 each), patient global assessment of disease activity, and C-reactive protein (a laboratory marker of inflammation that is sensitive to acute changes in inflammatory response).

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 260 visit. Analysis used observed data (no imputation).

The HAQ-DI is a measure of disability that ranges from 0 to 3. Decrease in score indicates improvement in physical function; a decrease of 0.22 or greater from Baseline score is clinically significant. Participants assessed their ability to perform at least 6 of the following 8 specific tasks (1. dress/groom; 2. arise; 3. eat; 4. walk; 5. reach; 6. grip; 7. maintain hygiene; 8. maintain daily activity) over the past week by marking their response on a questionnaire. Possible responses/scores included the following: without any difficulty (0); with some difficulty (1); with much difficulty (2); and unable to do (3). The 8 task scores are added and the sum is divided by the number of tasks assessed (range = 6 to 8). This yields a HAQ-DI score of 0 to 3.

All participants who received at least 1 dose of open-label adalimumab in the continuation study (Full Analysis Set) and had a Week 520 visit. Analysis used observed data (no imputation).

The HAQ-DI is a measure of disability that ranges from 0 to 3. Decrease in score indicates improvement in physical function; a decrease of 0.22 or greater from Baseline score is clinically significant. Participants assessed their ability to perform at least 6 of the following 8 specific tasks (1. dress/groom; 2. arise; 3. eat; 4. walk; 5. reach; 6. grip; 7. maintain hygiene; 8. maintain daily activity) over the past week by marking their response on a questionnaire. Possible responses/scores included the following: without any difficulty (0); with some difficulty (1); with much difficulty (2); and unable to do (3). The 8 task scores are added and the sum is divided by the number of tasks assessed (range = 6 to 8). This yields a HAQ-DI score of 0 to 3.

All participants who received at least 1 dose of open-label adalimumab (Full Analysis Set) in the continuation study and had a Week 260 visit. Analysis used observed data (no imputation).