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Weighted Kaplan-Meier estimates of the cumulative risk of ocular herpes simplex virus recurrence among 308 participants in the Herpetic Eye Disease Study during person-weeks with an ultraviolet index value of ≥4 (top) or <4 (bottom), 1993–1997. Results were pooled over 30 imputations. Solid line, high sunlight exposure (≥8 hours/week); dashed line, low sunlight exposure (≤7 hours/week).
