Comparison of consecutive 28-joint disease activity scores between persistent patients and nonpersistent patients. Consecutive 28-joint disease activity score (DAS28) for persistent patients (blue bars) and nonpersistent patients (green bars). Thick line in middle of bar, mean DAS28 value; top and bottom of bar, upper and lower quartiles, respectively; top and bottom lines, maximum and minimum values, respectively. x axis, consecutive visits (V); y axis, DAS28 values. *Differences with P ≤ 0.05. SD, standard deviation.