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.