Table 2.

MRI JSN scores in patients with RA and healthy controls in Exercise 2: Distribution, intraobserver and interobserver agreement, and correlation with radiographic JSN scores. MRI scores, intraobserver ICC, and correlations with radiographic scores are given for the experienced musculoskeletal radiologist. Intraobserver ICC (only average measure ICC provided) are given for all 5 readers.

MRI JSN Score	Score Characteristics		Observed Scores, median (range)		Intraobserver Agreement		Interobserver Agreement	Agreement with X-ray_SvdH-total
	No. Assessed Areas	Possible Range	RA	Controls	ICC (single measure)	ICC (average measure)	ICC (average measure)	ICC (single measure)
MRI_Total	21	0–84	7 (1–62)	2.5 (0–7)	0.90	0.95	0.92	0.77
MRI_MCP2-5	4	0–16	1 (0–6)	0 (0–0)	0.79	0.89	0.86	0.15
MRI_Wrist	17	0–68	5 (1–57)	2.5 (0–7)	0.92	0.96	0.93	0.84
MRI_SvdH-total	11	0–40	2.8 (0–24)	1 (0–2.5)	0.87	0.93	0.90	0.75
MRI_SvdH-wrist	7	0–24	2 (0–19)	1 (0–2.5)	0.92	0.96	0.94	0.68
MRI_Genant-total	11	0–28	1.3 (0–13.3)	0.3 (0–0.7)	0.82	0.90	0.89	0.49
MRI_Genant-wrist	7	0–12	0.7 (0–8.3)	0.3 (0–0.7)	0.89	0.94	0.95	0.35
MRI_OM14	14	0–56	5 (1–48)	2.5 (0–5)	0.93	0.96	0.93	0.89
MRI_OM7	7	0–28	1 (1–22)	1.5 (0–2)	0.91	0.95	0.95	0.79

SvdH: Sharp-van der Heijde; ICC: intraclass correlation coefficient. See Table 1 for description of joint spaces included in the various MRI JSN scores.