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Table 5 Intra-observer agreements for spinal MRI changes

From: Spondyloarthritis-related and degenerative MRI changes in the axial skeleton - an inter- and intra-observer agreement study

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
  1. BMO; Bone marrow oedema, DVU; Discovertebral unit, FMD; Fatty marrow deposition, - Too few positive ratings for one of the observers to be included in the analysis 1Discovertebral units or vertebral endplates. 2Only observations where both readers agreed on the presence of a signal change were kept in the analysis.