Table 2

Prevalence of observed lesions, observed agreement, intraobserver and interobserver reliabilities when scoring synovitis in metacarpophalangeal joints on static images

Intraobserver					Interobserver
	Prevalence % (min–max)	Observed agreement (min–max)	Kappa range (min–max) (y/n) + 95% CI	Kappa range (min–max) (0–3) + 95% CI	Prevalence % (mean)	Observed agreement (mean)	Mean kappa (y/n) + 95% CI	Mean kappa (0–3) + 95% CI
SH	Grade 0: 9–34	0.31–0.94	−0.01–0.94 (−0.31–0.31 to 0.82–1)	0.06–0.96 (−0.42–0.27 to 0.9–1)	Grade 0: 22	0.76	0.57 (0.35 to 0.57)	0.78 (0.54 to 0.78)
	Grade 1: 11–33				Grade 1: 21
	Grade 2: 8–47				Grade 2: 35
	Grade 3: 38–67				Grade 3: 23
PD	Grade 0: 59–71	0.5–1	−0.03–1.0 (−0.34–0.29 to 0.77–1)	0.01–1.0 (−0.28–0.26 to 1–1)	Grade 0: 66	0.88	0.97 (0.8 to 0.97)	0.98 (0.80 to 0.98)
	Grade 1: 4–15				Grade 1: 10
	Grade 2: 11–9				Grade 2: 15
	Grade 3: 5–14				Grade 3: 9
Combined score* (SH+PD)	Grade 0: 13–70	0.39–1	−0.01–1.0 (−0.24–0.4 to 1–1)	0.06–1.0 (−0.0–0.4 to 1–1)	Grade 0: 32	0.81	0.80 (0.51 to 0.80)	0.79 (0.57 to 0.79)
	Grade 1: 4–60				Grade 1: 20
	Grade 2: 8–45				Grade 2: 28
	Grade 3: 6–67				Grade 3: 20

*EULAR-OMERACT combined score.
EULAR-OMERACT, European League Against Rheumatisms–Outcomes Measures in Rheumatology; PD, power Doppler; SH, synovial hypertrophy.