MRI changes | Observers | Observed agreement (%) | Expected agreement (%) | Weighted Kappa (95% CI) | Number of SIJ regions |
---|---|---|---|---|---|
BMO | AA | 99.57 | 89.42 | .96 (.92–.98) | 384 |
BB | 98.99 | 89.19 | .91 (.85–.95) | 384 | |
  Intensity of BMO 1 | AA | 92.42 | 67.36 | .77 (.58–.96) | 66 |
BB | 95.95 | 83.97 | .75 (.47–1.00) | 74 | |
  Depth of BMO 1 | AA | 95.45 | 51.93 | .91 (.80–1.00) | 66 |
BB | 91.89 | 55.84 | .82 (.68–.96) | 74 | |
FMD | AA | 99.33 | 85.49 | .95 (.92–.97) | 384 |
BB | 98.06 | 82.15 | .89 (.84–.93) | 384 | |
  Depth of FMD 1 | AA | 95.57 | 52.40 | .80 (.64–.97) | 53 |
BB | 87.88 | 52.25 | .75 (.58–.91) | 66 | |
Erosions | AA | 98.61 | 93.52 | .79 (.60–.92) | 348 |
BB | 99.02 | 91.96 | .88 (.80–.93) | 384 | |
Subchondral sclerosis | AA | 99.62 | 96.84 | .88 (.71–.96) | 384 |
BB | 99.62 | 96.48 | .89 (.77–.95) | 384 | |
Ankylosis | AA | - | - | - | - |
BB | 99.54 | 97.26 | .83 (.52–.95) | 384 | |
Global assessment2 | AA | 98.37 | 84.61 | .89 (.82–.95) | 463 |
 | BB | 95.79 | 80.20 | .79 (.52–.93) | 463 |