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Table 4 Inter-rater agreement, surgeon vs. RC1 (1st abstraction) and RC2

From: Reliability of medical record abstraction by non-physicians for orthopedic research

  Data elements Kappa 95% CI % Agreement
RC1 Index knee 1.00 (1.00, 1.00) 100
Bilateral operation 1.00 (1.00, 1.00) 100
Arthroplasty approach type 0.59 (0.19, 0.99) 97.3
Cement fixation 0 (0.00, 0.00) 98.6
Lateral release type 0.93 (0.83, 1.00) 97.3
Posterior cruciate ligament recession 0.86 (0.74, 0.99) 94.5
Knee alignment 0.80 (0.68, 0.92) 89.2
Knee predominant compartment 0.66 (0.51, 0.81) 82.4
RC2 Index knee 1.00 (1.00, 1.00) 100
Bilateral operation 1.00 (1.00, 1.00) 100
Arthroplasty approach type 0.49 (0.00, 1.00) 97.3
Cement fixation 0 (0.00, 0.00) 98.5
Lateral release type 0.68 (0.50, 0.85) 86.3
Posterior cruciate ligament recession 0.74 (0.57, 0.90) 88.9
Knee alignment 0.53 (0.39, 0.66) 70.4
Knee predominant compartment 0.53 (0.37, 0.69) 74.6