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Table 6 Intra-rater agreement, RC1 (1st abstraction) vs. RC1 (2nd abstraction)

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

Data elements Kappa 95% CI % Agreement
Index knee 0.97 (0.92, 1.00) 98.6
Bilateral operation 1.00 (1.00, 1.00) 100
Arthroplasty approach type 0.66 (0.21, 1.00) 97.3
Cement fixation - - 100
Lateral release type 1.00 (1.00, 1.00) 100
Posterior cruciate ligament recession 1.00 (1.00, 1.00) 100
Knee alignment 1.00 (1.00, 1.00) 100
Knee predominant compartment 1.00 (1.00, 1.00) 100