Table 5 Intra-observer agreements for spinal MRI changes
MRI changes | Observers | Observed agreement (%) | Expected agreement (%) | Pairwise weighted Kappa (95% CI) | Number of levels1 |
|---|---|---|---|---|---|
Type of signal change | AA | 98.32 | 89.88 | .84 (.78–.88) | 2208 |
BB | 97.96 | 87.00 | .84 (.80–.88) | 2208 | |
  Signal change in the corner 2 | AA | 89.22 | 54.61 | .76 (.63–.90) | 102 |
BB | 87.31 | 54.81 | .72 (.60–.84) | 134 | |
  Location of signal change 2 | AA | 99.02 | 42.43 | .98 (.94–1.00) | 102 |
BB | 96.27 | 43.54 | .93 (.87–.99) | 134 | |
  Size of signal change 2 | AA | 99.02 | 87.80 | .92 (.85–.97) | 102 |
BB | 98.18 | 91.18 | .79 (.64–.91) | 134 | |
Total size of BMO in the DVU | AA | 99.51 | 98.89 | .56 (.23–.78) | 1104 |
BB | 99.76 | 99.16 | .71(.48–.88) | 1104 | |
Total size of FMD in the DVU | AA | 99.43 | 98.64 | .58 (.39–.74) | 1104 |
BB | 99.81 | 99.12 | .78 (.67–.87) | 1104 | |
Total size of mixed lesions in the DVU | AA | 99.83 | 99.43 | .71 (0.00–.95) | 1104 |
BB | 99.61 | 98.52 | .73 (.50–.88) | 1104 | |
Erosions | AA | - | - | - | - |
BB | 99.91 | 99.61 | .77 (.47–.91) | 2208 | |
Syndesmophytes or vertebral fusion | AA | 99.95 | 99.19 | .94 (.67–1.00) | 1104 |
BB | 99.93 | 99.57 | .83 (.40–.98) | 1104 | |
BMO at the apophyseal joint | AA | 99.82 | 98.38 | .88 (.73–1.00) | 1104 |
BB | - | - | - | - | |
Disc degeneration | AA | 99.58 | 94.43 | .92 (.89–.95) | 1104 |
BB | 99.55 | 95.35 | .90 (.87–.93) | 1104 | |
Disc contour | AA | 99.26 | 94.28 | .87 (.82–.91) | 1104 |
BB | 99.25 | 93.36 | .89 (.84–.93) | 1104 | |
Herniation in the vertebral endplate | AA | 99.82 | 96.09 | .95 (.89–1.00) | 1104 |
BB | 98.91 | 95.92 | .73 (.59–.88) | 1104 | |
Scheurmann’s changes | AA | 99.55 | 98.12 | .76 (.56–.96) | 1104 |
|  | BB | 99.55 | 98.65 | .67 (.39–.94) | 1104 |