Study Evaluating the Efficacy and Safety of Etanercept and Methotrexate in Japanese Subjects With Rheumatoid Arthritis

mTSS = sum of erosion and JSN scores for 44 joints (16 per hand and 6 per foot). mTSS scores ranged from 0 (normal) to 448 (worst possible total score). Change = scores at observation minus score at Baseline. An increase in mTSS from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represents improvement.

Joint erosion score: erosion severity in 44 joints (16 per hand, 6 per foot). Each joint scored according to surface area involved, from 0 (no erosion) to 5 (extensive bone loss from more than one half of articulating bone). Because each side of foot joint was graded, maximum erosion score for foot joint was 10. Thus, maximum erosion score was 280. Change = score at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

JSN score: severity of JSN in 42 joints (15 per hand and 6 per foot), including subluxation, scored from 0 (no/normal JSN) to 4 (complete loss of joint space, bony ankylosis, or luxation). Maximum JSN score was 168. Change = scores at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

Absence of joint destruction defined by 3 categories (mTSS change <=0.5, <=3.0, and <smallest detectable difference [SDD] where SDDs were scores >3.0). mTSS = sum of erosion and JSN scores for 44 joints (16 per hand and 6 per foot). mTSS scores ranged from 0 (normal) to 448 (worst possible total score).

American College of Rheumatology (ACR) swollen joint count was an assessment of 68 joints. Joints classified as either swollen or not swollen. Change = scores at observation minus score at Baseline, and total possible scores ranged from -68 to 68. An increase in swollen joints from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

71 joints assessed by the investigator using criteria based on pressure and joint manipulation. Change = scores at observation minus score at Baseline, and total possible scores ranged from -71 to 71. An increase in tender joint count from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

Physician Global Assessment of symptoms, assessed using a 11-point rating scale, where 0=asymptomatic and 10=severe symptoms. Change = scores at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

Patient's Global Assessment of symptoms, assessed using a 11-point rating scale, where 0=asymptomatic and 10=severe symptoms. Change = scores at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

Morning stiffness in and around the joints lasting at least 1 hour before maximal improvement. Change = scores at observation minus score at Baseline. An increase in stiffness duration from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

100 millimeter (mm) line (VAS) marked by participant. Intensity of pain range (over past week): 0mm = no pain to 100mm = worst possible pain. Change = scores at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

100mm line (VAS) marked by participant. Participants asked, "In general how would you rate your health over the last 2-3 weeks?" 0mm=very well to 100mm=extremely bad. Change = scores at observation minus score at Baseline. An increase in score from baseline represented disease progression and/or joint worsening, no change represented halting of disease progression, and a decrease represented improvement.

HAQ-DI: participant-reported assessment of ability to perform tasks: 1) dress/groom; 2) arise; 3) eat; 4) walk; 5) reach; 6) grip; 7) hygiene; and 8) common activities over past week. Each item scored on 4-point Likert scale from 0 to 3: 0=no difficulty; 1=some difficulty; 2=much difficulty; 3=unable to do. Change = scores at observation minus score at Baseline and total possible scores ranged from -3 to 3. An increase in score from baseline represented disease progression and/or joint worsening and a decrease represented improvement.

ACR20 response: greater than or equal to (≥) 20 percent (%) improvement in tender joint count; ≥ 20% improvement in swollen joint count; and ≥ 20% improvement in at least 3 of 5 remaining ACR core measures: participant assessment of pain; participant 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 (CRP).

ACR50 response: ≥ 50% improvement in tender joint count; ≥ 50% improvement in swollen joint count; and ≥ 50% improvement in at least 3 of 5 remaining ACR core measures: participant assessment of pain; participant global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the HAQ); and CRP.

ACR70 response: ≥ 70% improvement in tender joint count; ≥ 70% improvement in swollen joint count; and ≥ 70% improvement in at least 3 of 5 remaining ACR core measures: participant assessment of pain; participant global assessment of disease activity; physician global assessment of disease activity; self-assessed disability (disability index of the HAQ); and CRP.

DAS: weighted calculation of joint tenderness score (Ritchie Articular Index[RAI]), swollen joint count of 44 joints, natural logarithm (ln) of erythrocyte sedimentation rate (ESR) in millimeters per hour (mm/hr), and general health (GH) using VAS. RAI defined as sum of 26 possible 0 to 3 tender scores. DAS = 0.53938 square root (√) (RAI) + 0.06465 (swollen joint count) + 0.330 (ln ESR) + 0.00722 (GH). Change from baseline = DAS at Week x minus Baseline DAS. Total DAS scores could range from 10 (worse outcome) to 0 (better outcome).

DAS based on 28 painful joint counts, 28 swollen joint counts, ESR, and GH. DAS28 score calculated as 0.56 √ (28 painful joint count) + 0.28 √ (28 swollen joint count) + 0.70 (ln ESR mm/hr) + 0.014 GH. Change from baseline = DAS at Week x minus Baseline DAS. Total DAS scores could range from 10 (worse outcome) to 0 (better outcome).

CRP: marker of inflammation. Higher level consistent with inflammation. Normal CRP range: 0 to 1.0 milligrams per deciliter (mg/dL).

ESR: laboratory test that provided a non-specific measure of inflammation. The test assessed the rate at which red blood cells fell in a test tube and was measured in mm/hour. Normal range: 0-30mm/h. Higher rate consistent with inflammation.