Fig. 2.

Percent achieving MCID in pain, by follow-up time point. Nonparticipant group denominator was n = 154 at 3 months, n = 140 at 6 months, and n = 153 at 12 months. Intervention group denominator was n = 2123 at 3 months, n = 1282 at 6 months, and n = 706 at 12 months. Differences between comparison and intervention group were statistically significant at * p < =.01 and ** p < =.001