Table 1.
Paired cross-sectional (CS) and longitudinal (L) reliability for main features assessed in WORMS. Kappa values (95% confidence intervals). BMLs: bone marrow lesions.
| Category | R1 vs. R2 | R1 vs. R3 | R1 vs. R4 | R2 vs. R3 | R2 vs. R4 | R3 vs. R4 | |
|---|---|---|---|---|---|---|---|
| Cartilage morphology | CS | 0.85 (0.81,0.90) | 0.86 (0.82,0.90) | 0.82 (0.77,0.87) | 0.77 (0.71,0.82) | 0.79 (0.73,0.84) | 0.87 (0.82,0.91) |
| L | 0.78 (0.67,0.90) | 0.77 (0.66,0.88) | 0.63 (0.49,0.78) | 0.63 (0.49,0.77) | 0.62 (0.46,0.77) | 0.70 (0.56,0.84) | |
| Osteophytes | CS | 0.64 (0.57,0.72) | 0.52 (0.46,0.59) | 0.47 (0.40,0.54) | 0.49 (0.42,0.56) | 0.48 (0.41,0.55) | 0.80 (0.76,0.84) |
| L | 0.61 (0.47,0.75) | 0.58 (0.43,0.72) | 0.54 (0.40,0.69) | 0.48 (0.33,0.64) | 0.43 (0.27,0.58) | 0.76 (0.66,0.86) | |
| BMLs | CS | 0.89 (0.84,0.94) | 0.81 (0.74,0.88) | 0.81 (0.74,0.88) | 0.80 (0.74,0.87) | 0.83 (0.76,0.90) | 0.86 (0.81,0.92) |
| L | 0.88 (0.80,0.96) | 0.82 (0.73,0.92) | 0.80 (0.70,0.91) | 0.75 (0.63,0.87) | 0.79 (0.68,0.91) | 0.80 (0.69,0.91) | |
| Subchondral cysts | CS | 0.68 (0.46,0.90) | 0.54 (0.32,0.77) | 0.50 (0.27,0.72) | 0.51 (0.29,0.73) | 0.48 (0.26,0.69) | 0.93 (0.82,1.00) |
| L | 0.60 (0.23,0.97) | 0.70 (0.39,1.00) | 0.70 (0.39,1.00) | 0.60 (0.29,0.91) | 0.60 (0.29,0.91) | 1.00 (1.00,1.00) | |
| Bone attrition | CS | 0.79 (0.70,0.89) | 0.76 (0.69,0.83) | 0.71 (0.63,0.80) | 0.79 (0.70,0.88) | 0.80 (0.70,0.89) | 0.88 (0.80,0.95) |
| L | 0.71 (0.48,0.95) | 0.67 (0.46,0.88) | 0.61 (0.38,0.83) | 0.51 (0.24,0.78) | 0.55 (0.28,0.82) | 0.77 (0.58,0.97) | |
| Meniscal tears | CS | 0.94 (0.90,0.98) | 0.92 (0.88,0.97) | 0.92 (0.87,0.97) | 0.97 (0.93,1.00) | 0.92 (0.87,0.98) | 0.96 (0.92,0.99) |
| L | 0.92 (0.81,1.00) | 0.84 (0.68,1.00) | 0.75 (0.55,0.95) | 0.91 (0.79,1.00) | 0.81 (0.63,1.00) | 0.89 (0.73,1.00) | |
| Meniscal extrusion | CS | 0.83 (0.69,0.98) | 0.82 (0.67,0.97) | 0.86 (0.72,1.00) | 0.71 (0.52,0.90) | 0.67 (0.46,0.88) | 0.81 (0.65,0.97) |
| L | 0.81 (0.62,1.00) | 0.75 (0.55,0.95) | 0.95 (0.87,1.00) | 0.67 (0.42,0.91) | 0.77 (0.57,0.96) | 0.81 (0.60,1.00) | |
| Hoffa-synovitis | CS | 0.60 (0.38,0.83) | 0.58 (0.36,0.80) | 0.45 (0.24,0.66) | 0.16 (0.10,0.42) | 0.24 (0.04,0.52) | 0.59 (0.32,0.82) |
| L | 0.64 (0.00,1.00) | 0.44 (0.21,1.00) | 0.31 (0.27,0.90) | 0.64 (0.00,1.00) | 0.45 (0.15,1.00) | 0.77 (0.35,1.00) | |
| Effusion-synovitis | CS | 0.89 (0.75,1.00) | 0.88 (0.72,1.00) | 072 (0.51,0.92) | 0.78 (0.56,0.99) | 0.62 (0.40,0.84) | 0.57 (0.32,0.82) |
| L | 0.85 (0.57,1.00) | 0.64 (0.28,1.00) | 0.85 (0.57,1.00) | 0.47 (0.08,0.86) | 0.70 (0.28,1.00) | 0.47 (0.08,0.86) |