Intrareader and interreader reliability for the PsAMRIS features in the hand and foot.
| PsAMRIS Features | Baseline SmICC (range reader 1 to 3) | Change SmICC (range reader 1 to 3) Intrareader | Change SDC (range reader1 to 3) | Baseline AvmICC | AvmICC Change Interreader | Change SDC |
|---|---|---|---|---|---|---|
| Hand | ||||||
| Synovitis | 0.30 to 0.71 | 0.06 to 0.66 | 1.7 to 5.5 | 0.72 | 0.41 | 2.9 |
| Flexor tenosynovitis | 0.69 to 0.89 | 0.78 to 0.88 | 2.2 to 2.6 | 0.92 | 0.87 | 1.9 |
| Periarticular inflammation | 0.74 to 0.95 | 0.22 to 0.85 | 0.4 to 5.8 | 0.37 | 0.12 | 1.8 |
| Bone marrow edema | 0.60 to 0.93 | −0.06 to 0.72 | 1.5 to 2.9 | 0.84 | 0.81 | 0.8 |
| Bone erosion | 0.67 to 0.95 | −0.06 to 0.04 | 0.0 to 1.4 | 0.90 | 0.23 | 0.4 |
| Bone proliferation | 0.00 to 0.74 | NP*/0.00 | 0.0 to 0.3 | 0.25 | 0.06 | 0.2 |
| Foot | ||||||
| Synovitis | 0.70 to 0.77 | 0.19 to 0.90 | 1.7 to 2.9 | 0.90 | 0.72 | 1.7 |
| Flexor tenosynovitis | 0.57 to 0.66 | 0.42 to 0.79 | 0.8 to 2.4 | 0.44 | 0.40 | 1.6 |
| Periarticular inflammation | 0.14 to 0.60 | 0.00 to 0.38 | 0.6 to 2.5 | 0.76 | 0.77 | 0.8 |
| Bone marrow edema | 0.70 to 0.96 | −0.04 to 0.38 | 2.3 to 4.0 | 0.96 | 0.75 | 1.0 |
| Bone erosion | 0.75 to 0.97 | −0.02 to 0.61 | 0.3 to 1.6 | 0.73 | 0.30 | 0.7 |
| Bone proliferation | −0.15 to 0.59 | NP*/0.00 | 0.0 to 0.3 | 0.50 | 0.07 | 0.1 |
↵* Not possible to calculate owing to zero variance in scores. Intraclass correlation coefficients (ICC) are expressed as single measure (SmICC) for intrareader reliability and average measure (AvmICC) for interreader reliability. Smallest detectable change (SDC) is shown for change scores. Interreader reliability was calculated from the mean value of each reader’s 2 readings for each patient. ICC is interpreted as follows: Very good: ≥ 0.80, good 0.50–0.79, poor < 0.49. PsAMRIS: Psoriatic Arthritis Magnetic Resonance Imaging Score.