Inter-reader reliability of MRI features in the distal interphalangeal (DIP) and proximal interphalangeal (PIP) joints (data from first part of the reliability exercise) (score range in brackets)
| Average measure ICC (95% CI) | PEA | PCA | SDD | |
|---|---|---|---|---|
| Synovitis (0–24) | 0.84 (0.50 to 0.96) | 46 | 98 | 2.4 |
| Flexor tenosynovitis (0–24) | 0.64 (0.05 to 0.90) | 36 | 80 | 3.1 |
| Erosions (0–48) | 0.94 (0.74 to 0.99) | 54 | 89 | 4.7 |
| Cysts (0–16) | 0.59 (−0.04 to 0.88) | 94 | NA | 1.1 |
| Osteophytes (0–48) | 0.91 (0.58 to 0.98) | 33 | 89 | 4.7 |
| Joint space narrowing (0–24) | 0.99 (0.95 to 1.00) | 70 | 99 | 1.4 |
| Malalignment frontal (0–8) | 0.95 (0.86 to 0.99) | 93 | NA | 0.5 |
| Malalignment sagittal (0–8) | 0.00 (−1.93 to 0.73) | 99 | NA | 0.3 |
| BMLs (0–48) | 0.83 (0.51 to 0.96) | 77 | 96 | 3.0 |
| CL absence (0–16) | 0.79 (0.42 to 0.94) | 63 | NA | 3.9 |
| BMLs at CL insertion sites (0–32) | 0.42 (−0.29 to 0.82) | 85 | NA | 3.5 |
BMLs, bone marrow lesions; CL, collateral ligament; ICC, intraclass coefficient; NA, not applicable (dichotomous variable); PCA, percentage close agreement; PEA, percentage exact agreement; SDD, smallest detectable difference.