Table 3 Reliability of FAt Spondyloarthritis Spine Score stratified according to the time interval between MRI scans
Time interval between MRI scans (years) | FASSS | Smallest detectable change | Reliability | |||||
|---|---|---|---|---|---|---|---|---|
Reader 1 | Reader 2 | ICCs (95% CI) | ||||||
Baseline | Change | Baseline | Change | Baseline | Change | |||
0 to ≤1.0 (n = 20) | 0.7 (0.3; 0.3 to 1.0) | 21.8 (32.1) | 3.7 (6.7) | 19.7 (30.2) | 6.8 (12.8) | 4.5 | 0.96 (0.89 to 0.98) | 0.74 (0.44 to 0.89) |
>1.0 to ≤1.5 (n = 49) | 1.3 (0.2; 1.01 to 1.5) | 18.2 (20.9) | 4.2 (8.7) | 17.3 (19.2) | 5.5 (9.5) | 3.3 | 0.88 (0.80 to 0.93) | 0.83 (0.72 to 0.90) |
>1.5 to ≤2.0 (n = 28) | 1.9 (0.1; 1.51 to 2.0) | 28.8 (40.8) | 5.1 (14.0) | 27.0 (38.1) | 6.7 (15.5) | 4.2 | 0.98 (0.97 to 0.99) | 0.90 (0.80 to 0.95) |
>2.0 (n = 38) | 2.6 (0.7; 2.01 to 4.9) | 23.9 (28.4) | 3.8 (11.9) | 22.4 (28.0) | 5.8 (12.6) | 3.4 | 0.97 (0.94 to 0.98) | 0.90 (0.80 to 0.95) |