EQ-5D™-derived utility values for different levels of migraine severity from a UK sample of migraineurs

Table 2 Analysis of Mean EQ-5D Utilities and Disutilities and Comparison to a Value of 1.0 ("no problems on any EQ-5D dimension")

Level	N	Mean Disutility = (1 – Utility)	Health Utility
Level	N	Mean Disutility = (1 – Utility)	Mean Utility	SD	Lower 95% CI	Upper 95% CI	P Value*
Current health without migraine	105	0.13	0.87	0.15	0.84	0.90	<0.0001
Mild	95	0.34	0.66	0.23	0.62	0.71	<0.0001
Moderate	90	0.47	0.53	0.27	0.47	0.59	<0.0001
Severe	69	1.20	-0.20	0.29	-0.27	-0.13	<0.0001

* P-values resulting from the one-sided t-test using the null hypothesis that mean equals 1 (i.e., "no problems on any EQ-5D dimension").

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