Figure 1.

Multivariate odds ratios and 95% confidence interval for developing obesity during follow-up for categories of sleep duration in (A) men and (B) women in the National Institutes of Health-AARP Diet and Health Study, 1995–1996. The analysis included men (n = 35,319) and women (n = 32,025) who were not obese at baseline. The number of participants who developed obesity in less than 5 hours, 5–6 hours, 7–8 hours, and 9 or more hours sleep categories were: 62 (10.8%), 792 (7.7%), 1448 (6.2%), and 68 (7.0%) in men and 89 (12.8%), 921 (9.3%), 1,530 (7.5%), and 66 (6.8%) in women, respectively. Multivariate models were adjusted for age, baseline body mass index, race/ethnicity, marital status, educational level, self-reported health, smoking status, alcohol consumption, and coffee consumption. P for trend = 0.25 for men and <0.0001 for women.