Fig. 1

Change score intraclass correlation coefficients for all raters pre- and post-recalibration. Legend: SIS measures inflammation and had N = 26 and N = 19 subjects for scoring exercises 1 and 2. SSS components include backfill, fat metaplasia, sclerosis, erosion, and ankylosis, with N = 12 and N = 18 subjects for scoring exercises 1 and 2, respectively. Dotted horizontal lines represent the a priori acceptability thresholds for change scores and were ICC > 0.7 for SIS and > 0.5 for all SSS components. Solid error bars indicate the 95% confidence intervals. SIS sacroiliac joint inflammation score, SSS sacroiliac joint structural score, ICC intraclass correlation coefficient