A Study to Determine the Effect of Methotrexate (MTX) Dose on Clinical Outcome and Ultrasonographic Signs in Subjects With Moderately to Severely Active Rheumatoid Arthritis (RA) Treated With Adalimumab (MUSICA)

Percentage of Participants With Power Doppler Ultrasound (PD U/S) Score for Synovial Vascularity Improvement by 30% at Week 24

PD U/S assessed the severity of synovial inflammation in both hands (bilateral wrists, metacarpophalangeal joints 2, 3, 5, and metatarsophalangeal joint 5). Bilateral images based on dorsal midline imaging of the wrist, dorsal and volar imaging of metacarpophalangeal joints, and dorsal imaging alone of metatarsophalangeal joints are scored using a 4-grade scale: grade 0 or normal = normal joint (no Doppler signal); grade 1 or mild = mild synovitis (≤ 3 isolated signals); grade 2 or moderate = moderate synovitis (\> 3 isolated signals or a confluent signal in \< 50% of synovial area); grade 3 or marked = marked synovitis (signals in ≥ 50% of the synovial area). Each image is rated 0 to 3, for a total possible score ranging from 0 to 48 (16\*0, 16\*3) for 2 hands. Higher grade/score=more severe disease. Change = week 24 score - baseline score.

Time frame: Baseline, 24 weeks

Percentage of Participants With American College of Rheumatology 50% (ACR50) Criteria Response at Week 24

Response, as defined by ACR50 criteria at week 24. A participant is a responder if the following 3 criteria for improvement from baseline are met: ≥ 50% improvement in tender joint count; ≥ 50% improvement in swollen joint count; and ≥ 50% improvement in at least 3 of the 5 following parameters: physician global assessment of disease activity, participant global assessment of disease activity, participant assessment of pain, disability index of the health assessment questionnaire, and acute phase reactant value (C-reactive protein).

Time frame: Baseline, 24 weeks

Percentage of Participants With American College of Rheumatology 70% (ACR70) Criteria Response at Week 24

Response, as defined by ACR70 criteria at week 24. A participant is a responder if the following 3 criteria for improvement from baseline are met: ≥ 70% improvement in tender joint count; ≥ 70% improvement in swollen joint count; and ≥ 70% improvement in at least 3 of the 5 following parameters: physician global assessment of disease activity, participant global assessment of disease activity, participant assessment of pain, disability index of the health assessment questionnaire, and acute phase reactant value (C-reactive protein).

Time frame: Baseline, 24 weeks

Percentage of Participants With a Change From Baseline in Health Assessment Questionnaire - Disability Index (HAQ-DI) ≤ -0.22 at Week 24

The HAQ-DI is a patient-reported questionnaire specific for rheumatoid arthritis. It consists of 20 questions referring to 8 domains: dressing/grooming, arising, eating, walking, hygiene, reach, grip, and daily activities. Participants assessed their ability to do each task over the past week using the following response categories: without any difficulty (0), with some difficulty (1), with much difficulty (2), and unable to do (3). Scores on each task were summed and averaged to provide an overall score ranging from 0 (no disability) to 3 (very severe, high dependency disability). The minimal clinically important difference (MCID) defined for the HAQ-DI is a change from baseline of ≤ -0.22. Normal physical function is defined by HAQ-DI score of \< 0.5. Negative change from baseline in the overall score indicates improvement.

Time frame: Baseline, 24 weeks

Percent Change From Baseline in Medical Outcomes Study Version II (MOS) Sleep Problem Index 9 at Week 24

The least squares mean percentage change in MOS Sleep Problem Index 9 from baseline to week 24. The MOS Sleep Problem Index 9 consists of 9 questions to assess sleep, including how long it takes the participant to fall asleep (1=0 to 15 minutes, to 5=more than 60 minutes); and aspects of related to quality of sleep, including how often the participant felt that the sleep was not quiet, felt rested upon waking, awakened short of breath or with a headache, felt drowsy during the day, had trouble falling sleep, how often were awaken, had trouble staying awake during the day, and got needed amount of sleep (1=all the time; 5=none of the time). Least squares means and 95% CI were from 2-way ANCOVA model with effects for baseline MOS Sleep Problem Index value, treatment group, and prior methotrexate dose group.

Time frame: Baseline, 24 weeks