Table 2.

Reliability and Validity of the WOMAC physical function subscale

Study	N	Population description	Internal consistency: Cronbach’s alpha	Test-retest reliability: ICC	Comparator	Correlation
Bellamy et al 19885	57	People from Canada with knee or hip OA who were taking part in a randomized controlled trial of 2 nonsteroidal anti-inflammatory drugs	Likert Scale format = 0.95. VAS format = 0.89		Lequesne Physical Function	r = 0.5
Xie et al 200841	131	People from Singapore, China with knee OA scheduled for TKA	> 0.7	> 0.8	SF-36 physical functioning and EQ-5D in Chinese and English	r > 0.5
Nadrian et al 201242	116	People from Iran with physician diagnosed referred to a rheumatology clinic with knee or hip OA	0.95	> 0.7	Lequesne Physical Function	r > 0.5
Thumboo et al 200143	66	English-speaking Chinese, Malay or Indian people with knee or hip OA seen at a tertiary referral center	0.93	> 0.8	SF-36 Physical Functioning	r = −0.4
Tüzün, et al., 200519	72	People from Turkey being seen in an outpatient physical therapy practice with knee OA	0.94		SF-36 Physical Functioning, Lequesne Physical Function	r = −0.7, r = 0.7
Basaran, et al., 201044	117	People from Turkey with knee or hip OA	0.95		SF-36 Physical Functioning	r = −0.8
Williams et al 201245	168	People with knee OA participating in a rehabilitation program.		> 0.8