Table 3A.

Inter- and intrareader reliability for PsAMRIS status and change scores. Intraclass correlation coefficients. Key to SRM values: Very good, ICC ≥ 0.80; good, 0.50 ≤ ICC < 0.80; poor, 0.20 ≤ ICC < 0.50; trivial, ICC < 0.20.

	Interreader Reliability, ICCa		Intrareader Reliability, ICCs
			Reader 1		Reader 2		Reader 3		Reader 4
PsAMRIS Features	Status	Change	Status	Change	Status	Change	Status	Change	Status	Change
Synovitis	0.95	0.95	0.97	0.78	0.73	0.63	0.93	0.65	0.90	0.38
Flexor tenosynovitis	0.97	0.95	0.81	0.92	0.74	0.73	0.93	0.80	0.73	0.90
Bone proliferation	0.77	0.10	0.20	0.26	0.84	0.87	0.79	0.73	0.44	0.46
Periarticular inflammation	0.91	0.91	0.39	NA^*	0.95	NA^*	0.88	0.33	0.91	NA^*
Bone marrow edema	0.87	0.87	0.98	0.63	0.97	0.13	0.99	1.00	0.03	0.80
Bone erosion	0.97	0.44	0.91	0.94	0.93	0.91	0.92	0.91	0.91	0.88

↵* Not calculable because zero variance. ICCa: average measure intraclass correlation coefficient; ICCs: single measure intraclass correlation coefficient; PsAMRIS: psoriatic arthritis magnetic resonance imaging score.