The simplified Chinese version of the Knee Injury and Osteoarthritis Outcomes Score (KOOS) in individuals with knee osteoarthritis for mainland China: the study of reliability and validity

Journal of Patient-Reported Outcomes

Table 3 Internal consistency of the KOOS subscales

KOOS Subscales (number of items)	Cronbach’s α coefficients (n = 158)
Pain (9)	0.902
Symptoms (7)	0.822
ADL (17)	0.970
Sport/Rec (5)	0.944
QOL (4)	0.757
Total (42)	0.973

ADL, Activities of daily living; Sport/Rec, Sports and recreation function; QOL, knee-related quality of life. The α values within 0.70 to 0.95 indicated acceptable internal consistency