Comparison of consecutive health assessment questionnaire scores between persistent patients and nonpersistent patients. Consecutive health assessment questionnaire (HAQ) scores for persistent patients (blue bars) and nonpersistent patients (green bars). Thick line in middle of bar, mean 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, HAQ values. *Differences with P ≤ 0.05. SD, standard deviation.