The Effect of Vitamin E on Common Cold Incidence Is Modified by Age, Smoking and Residential Neighborhood
Harri Hemilä, MD, PhD,
Jarmo Virtamo, MD, PhD,
Demetrius Albanes, MD and
Jaakko Kaprio, MD, PhD
Department of Public Health, University of Helsinki, (H.H., J.K.)
Department of Epidemiology and Health Promotion, National Public Health Institute (J.V.), Helsinki, FINLAND
Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland (D.A.)

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Fig. 1. The effect of vitamin E on the relative risk of common cold as a function of age at follow-up. Participants smoking more (A) and less (B) are further divided into subgroups by residential neighborhood. RR indicates the relative risk of colds between the vitamin E and placebo arms. See Table 2 for the description of the statistical models.
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Copyright © 2006 by the American College of Nutrition.