Do visual analogue scale (VAS) derived standard gamble (SG) utilities agree with Health Utilities Index utilities? A comparison of patient and community preferences for health status in rheumatoid arthritis patients

Table 2 Summary statistics for HUI2, HUI3 and SG utilities obtained from transformation of VAS scores by different power conversions

Assessment A		N	Mean	SD	Median	Min.	Max.
Unadjusted	SG1 ¹	308	0.79	0.18	0.85	0.08	1.00
	SG2	308	0.86	0.16	0.93	0.11	1.00
	SG3	308	0.87	0.15	0.93	0.11	1.00
	SG4	308	0.88	0.15	0.94	0.12	1.00
	SG5	308	0.90	0.14	0.96	0.13	1.00
	SG6	308	0.91	0.13	0.97	0.14	1.00
	SG7	308	0.77	0.15	0.81	0.18	0.99
	SG8	308	0.80	0.13	0.84	0.24	1.00
Adjusted	SG1	308	0.84	0.18	0.92	0.09	1.00
	SG2	308	0.90	0.15	0.97	0.12	1.00
	SG3	308	0.91	0.14	0.97	0.13	1.00
	SG4	308	0.91	0.14	0.98	0.13	1.00
	SG5	308	0.93	0.13	0.99	0.15	1.00
	SG6	308	0.93	0.12	0.99	0.16	1.00
	SG7	308	0.82	0.15	0.88	0.19	1.00
	SG8	308	0.85	0.13	0.90	0.26	1.00
	HUI2	307	0.72	0.19	0.75	0.12	1.00
	HUI3	306	0.66	0.21	0.68	0.14	1.00

¹Numbers indicate the power conversions (listed in Table 1) used to transform VAS scores to SG scores.

ISSN: 1477-7525