Table 4.

Rank ordering of instrument performance by various discriminative tests for the known group comparisons

		Effect Size	RE	ROC (AUC)
Self Rated Health	1	AQoL (-1.00)	AQoL (1.00)	AQoL (0.76)
	2	WOMAC (0.92)	WOMAC (0.84)	WOMAC (0.75)
	3	PCS (-0.84)	PCS (0.71)	PCS (0.67)
	4	VAS pain (0.79)	VAS pain (0.63)	VAS pain (0.65)
OWL v Community	1	WOMAC (-0.79)	WOMAC (1.57)	WOMAC (0.70)
group	2	VAS pain (0.74)	VAS pain (1.03)	VAS pain (0.70)
	3	AQoL (0.66)	AQoL (1.00)	AQoL (0.67)
	4	PCS (0.44)	PCS (0.46)	PCS (0.64)
	5	MCS (0.24)	MCS (0.13)	MCS (0.56)

Note: Comparison groups were Self-rated good vs. poor health and Orthopedic waiting list (OWL) vs. Community based group.