Influences on risk of relapse over six months. (A) Influences on patients in cohort 2 who were assigned placebo maintenance treatment. (B) Data from those in cohort 1 who were taking a variety of maintenance treatments. Data are shown as rate ratios. RA, rheumatoid arthritis; OA, osteoarthritis; GU, gastric ulcer; DU, duodenal ulcer; DDD, defined daily dose.