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Table 2 Internal consistency of the KOOS subscales, expressed by Cronbach's alpha

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

KOOS subscales Mild OA Moderate OA Severe OA TKA Revision of TKA
Pain (9 items) 0.94 0.93 0.80 0.92 0.87
Symptoms (7 items) 0.71 0.83 0.56 0.74 0.78
ADL (17 items) 0.78 0.97 0.94 0.94 0.93
Sport/Recreation (5 items) 0.87 0.95 0.98 0.88 0.95
QoL (4 items) 0.81 0.85 0.73 0.81 0.90
  1. Abbreviations: OA; osteoarthritis, TKA; total knee arthroplasty, Revision of TKA; Revision of total knee arthroplasty, ADL, Activities of daily living; QoL; Quality of life.