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Table 1 Weighted kappa values and 95% confidence intervals for inter- and intra-observer agreement of MRI for the three compartments of the knee joint.

From: Arthroscopy vs. MRI for a detailed assessment of cartilage disease in osteoarthritis: diagnostic value of MRI in clinical practice

  weighted kappa values and 95% confidence intervals
  patellofemoral compartment medial compartment lateral compartment all compartments
reader 1 vs. reader 2 0.51 (0.37-0.65) 0.59 (0.47-0.71) 0.75 (0.64-0.85) 0.65 (0.58-0.72)
AC vs. reader 1 0.52 (0.37-0.66) 0.62 (0.48-0.75) 0.65 (0.54-0.76) 0.62 (0.55-0.69)
AC vs. reader 2 0.32 (0.17-0.47) 0.49 (0.35-0.62) 0.57 (0.44-0.70) 0.50 (0.42-0.58)
  1. * AC = arthroscopic findings
  2. < 0.20 = poor, 0.21-0.40 = fair, 0.41-60 = moderate, 0.61-0.80 = good, 0.81-1.0 = very good