p < 0.001, abatacept vs. placebo. a Fixed dose approximating 10 mg/ kg (see section 4.2). b Concurrent DMARDs included one or more of the following: methotrexate, chloroquine/ hydroxychloroquine, sulfasalazine, leflunomide, azathioprine, gold, and anakinra. c Health Assessment Questionnaire; 0 = best, 3 = worst; 20 questions; 8 categories: dressing and grooming, arising, eating, walking, hygiene, reach, grip, and activities. d Reduction in HAQ-DI of ≥ 0.3 units from baseline. e After 6 months, patients were given the opportunity to enter into an open-label study.