Change in prednisone dose over time. (A) Percent change from baseline prednisone dose in clinical responders and clinical nonresponders over time. Points are medians with interquartile ranges. Wilcoxon rank-sum test was used for the group comparison. (B) Percent change in prednisone dose in nonresponders and responders from before treatment to 1 month after receiving 6 doses of abatacept.