Abstract
Introduction: Previous studies identify suboptimal sleep as a risk factor for metabolic syndrome (MetS), but many lack racial/ethnic minorities. Our study objective was to investigate the relationship between suboptimal sleep and risk of MetS by race/ethnicity. Hypothesis: We hypothesized that the positive association between suboptimal sleep and MetS is stronger among Black and Hispanic compared to White women. Methods: We used longitudinal data (2003-2015) from 50,884 female participants (aged 35-74 years) of the Sister Study who were non-pregnant and without cardiovascular disease or cancer. We defined suboptimal sleep by: duration (short: <7 hours, recommended: 7-<9 hours, long: ≥9 hours) and dichotomized (yes/no) sleep parameters including sleep irregularity (
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