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Table 3 Reliability of all subscales of the KOOS

From: The Dutch version of the knee injury and osteoarthritis outcome score: A validation study

   Baseline mean (SD) Retest mean (SD) Change scores mean (SD) SEM ICC agreement 95% CI
Mild OA (n = 35) Pain 85.3 (18.5) 89.7 (12.5) -4.4 (9.4) 7.2 0.80 0.60–0.90
  Symptoms 78.6 (7.1) 81.3 (16.8) -2.2 (12.8) 9.0 0.74 0.54–0.86
  ADL 91.2 (15.1) 93.5 (10.8) -2.3 (7.1) 5.2 0.85 0.71–0.92
  Sport/recreation 71.0 (23.4) 73.0 (22.9) -1.7 (12.8) 9.0 0.85 0.73–0.92
  QoL 67.0 (21.6) 69.6 (20.5) -2.5 (10.3) 7.4 0.88 0.77–0.94
Moderate OA (n = 53) Pain 62.9 (25.7) 63.2 (23.7) 0.0 (12.9) 9.0 0.87 0.78–0.92
  Symptoms 63.2 (24.4) 66.2 (21.9) -1.5 (11.3) 8.0 0.87 0.79–0.92
  ADL 69.3 (24.2) 69.2 (23.7) 0.6 (8.2) 5.8 0.94 0.90–0.97
  Sport/recreation 36.2 (32.0) 39.7 (32.5) -4.8 (15.9) 11.6 0.87 0.78–0.92
  QoL 44.6 (26.3) 47.3 (25.4) -2.1 (10.3) 7.4 0.91 0.86–0.95
Revision of TKA (n = 47) Pain 61.6 (23.4) 63.9 (21.9) -2.3 (14.3) 10.1 0.80 0.67–0.88
  Symptoms 64.7 (21.5) 62.9 (21.7) 1.7 (10.2) 7.2 0.89 0.81–0.94
  ADL 56.6 (21.9) 59.5 (22.9) -2.9 (16.4) 11.7 0.73 0.56–0.83
  Sport/recreation 26.8 (34.1) 27.4 (34.2) -2.2 (35.1) 24.6 0.45 0.19–0.66
  QoL 36.6 (26.6) 40.3 (27.5) -3.7 (14.9) 10.8 0.84 0.73–0.91
  1. Abbreviations: OA; osteoarthritis, SD, standard deviation; SEM, standard error of measurement; ICC agreement, intraclass correlation coefficient for agreement; CI, confidence interval. A normalized score (100 indicating no symptoms and 0 indicating extreme symptoms) is calculated for each subscale. Revision of TKA; Revision of total knee arthroplasty, AD; Activities of daily living; QoL; Quality of life.