Health-related quality of life in persons with West Nile virus infection: a longitudinal cohort study

Table 2 Mean utilities by time: Utility scores^a (95% confidence interval) at select study visits

	Cohort entry	10-day visit	30-day visit	6-month visit	12-month visit	24-month visit	30-month visit
Total cohort	0.59 (0.57, 0.62) n = 146	0.67 (0.64, 0.69) n = 106	0.72 (0.69, 0.75) n = 68	0.77 (0.74, 0.80) n = 95	0.80 (0.76, 0.84) n = 49	0.76 (0.66, 0.84) n = 12	0.77 (0.69, 0.84) n = 10
Neuro-invasive	0.54 (0.51, 0.57) n = 58	0.60 (0.57, 0.64) n = 38	0.67 (0.63, 0.72) n = 21	0.74 (0.69, 0.78) n = 39	0.81 (0.76, 0.86) n = 26	0.75 (0.65, 0.85) n = 8	0.77 (0.68, 0.86) n = 6
Non-neuro-invasive	0.63 (0.60, 0.66) n = 88	0.70 (0.67, 0.73) n = 68	0.74 (0.70, 0.78) n = 47	0.79 (0.76, 0.83) n = 56	0.80 (0.73, 0.85) n = 23	0.77 (0.57, 0.89) n = 4	0.76 (0.61, 0.86) n = 4

^aUtility scores range on a scale from 0 (equivalent to being dead) to 1 (equivalent to perfect health). Larger values indicate better health-related quality of life. Scores are derived from the Medical Outcomes Study Short-Form-6D health state classification

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