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Table 2 Agreement between two observers with respect to magnetic resonance imaging (MRI) characteristics per site per sacroiliac joint in 68 patients with inflammatory low back pain

From: Magnetic resonance imaging changes of sacroiliac joints in patients with recent-onset inflammatory back pain: inter-reader reliability and prevalence of abnormalities

MRI characteristic per site Sacroiliac joint Present (n) Absent (n) Concordance rate Discordance rate Cohen's kappa value
Inflammation       
   At any site Right 18 40 0.85 0.15 0.68
  Left 14 39 0.78 0.22 0.51
   Bone marrow ± subchondral bone Right 17 43 0.88 0.12 0.73
  Left 12 47 0.87 0.13 0.65
   Joint capsule Right 5 54 0.87 0.13 0.46
  Left 3 47 0.74 0.26 0.12
   Ligaments Right 4 57 0.90 0.10 0.49
  Left 3 57 0.88 0.12 0.38
   Joint space Right 6 55 0.90 0.10 0.58
  Left 8 54 0.91 0.09 0.68
Chronic changes Right 6 49 0.81 0.19 0.37
  Left 11 49 0.88 0.12 0.66