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Table 4 Standardized response means (SRM) for SIS and SSS components

From: Spondyloarthritis Research Consortium of Canada sacroiliac joint inflammation and structural scores: change score reliability and recalibration utility in children

ComponentAll raters
Mean (range)
SPARCC developers
Inflammation0.93 (0.9–0.95)0.91
Backfill0.55 (0.35–0.96)0.38
Fat metaplasia0.36 (0.34–0.47)0.30
Sclerosis0.70 (0.57–0.88)0.67
Erosion0.96 (0.7–1.39)0.78
Ankylosis0.28 (0.24–0.31)0.25
  1. Legend: An SRM of < 0.2 was considered a trivial effect, 0.2–0.5 small effect, 0.5–0.8 moderate effect, and > 0.8 large effect [12]
  2. SIS sacroiliac joint inflammation score, SSS sacroiliac joint structural score