Comparing the performance of the EQ-5D and SF-6D when measuring the benefits of alleviating knee pain

Table 1 Construct validity: Mean EQ-5D and SF-6D utility scores for each of the four baseline severity levels.

WOMAC severity level	Pain		Stiffness		Functioning		Overall (WOMAC₉₆)
	EQ-5D	SF-6D	EQ-5D	SF-6D	EQ-5D	SF-6D	EQ-5D	SF-6D
none to mild	0.696 (96)	0.714 (93)	0.672 (67)	0.686 (65)	0.722 (78)	0.732 (75)	0.722 (69)	0.731 (67)
>mild to moderate	0.572 (168)	0.658 (160)	0.602 (164)	0.676 (157)	0.606 (150)	0.671 (147)	0.618 (165)	0.679 (160)
>moderate to severe	0.383 (80)	0.567 (79)	0.462 (108)	0.601 (106)	0.409 (111)	0.574 (106)	0.390 (107)	0.562 (103)
>severe to extreme	0.092‡ (5)	0.471‡ (5)	0.027‡ (10)	0.477‡ (9)	0.148‡ (9)	0.478‡ (8)	0.069‡ (7)	0.460‡ (6)

The number of participants in each group are reported in brackets (N), results of the ANOVA are also noted (‡ p < 0.001).

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