Table 3

Construct validity, given as Spearman's correlations of the five KOOS subscales and the eight SF-36 subscales in patients following primary TKR (n=68)

	KOOS subscales
	Pain	Symptoms	ADL	Sports/Rec	QOL
SF-36 subscales
PF	0.34	0.32	0.53	0.42	0.43
RP	0.36	0.29	0.45	0.31	0.30
BP	0.57	0.41	0.46	0.28	0.50
GH	0.21	0.16	0.44	0.23	0.25
VT	0.26	0.23	0.44	0.06	0.26
SF	0.45	0.33	0.52	0.21	0.32
RE	0.36	0.29	0.42	0.24	0.30
MH	0.24	0.29	0.41	0.19	0.29

As hypothesised, expected correlations were above 0.35 for a priori hypotheses 1–3 (as shown in bold typeface).
ADL, activities of daily living; BP, bodily pain; GH, general health; KOOS, Knee injury and Osteoarthritis Outcome Score; MH, mental health; PF, physical functioning; QOL, quality of life; RE, role-emotional; RP, role-physical; SF, social functioning; SF-36, Short Form 36; Sports/Rec, sports and recreation function; TKR, total knee replacement; VT, vitality.