Abstract 16363: Contributions of Cardiovascular Disease Risk Factors to Racial/Ethnic Differences in Sleep Duration: Chicago Area Sleep Study
Introduction: Shortened sleep duration is associated with cardiovascular disease (CVD) risk factors (e.g., hypertension, obesity, diabetes). Epidemiologic studies in diverse samples describe shorter sleep durations among non-white adults as compared with non-Hispanic whites (NHW); however, many studies rely on self-reported sleep duration and include adults with sleep disordered breathing. We tested whether race/ethnic differences in sleep duration are attributable to differences in CVD risk factors in a sample of adults with low apnea/hypopnea index (AHI) scores.
Methods: The Chicago Area Sleep Study (CASS) recruited 373 participants ages 35-64 years (mean= 47) via commercially available telephone listings. Participants underwent 1 night of screening using in-home apnea detection equipment (ApneaLinkTM) and 297 had AHI<15. Participants wore wrist actigraphs for 7 days (ActiwatchTM) to determine sleep duration and underwent a clinical examination to measure CVD risk factors using standard protocols. Multivariable analysis of variance was used to compare differences in sleep duration by race group.
Results: In the sample with AHI<15, there were 103 NHW, 82 black, 57 Hispanic and 55 Asian participants and 64% were women. In unadjusted analyses, sleep duration was shortest in black participants (mean=396.9 min, SD=68.6), similar in Asians and Hispanics (431.5, SD=47.4 and 432.3, SD=76.6, respectively) and longest in NHW (445.5, SD=51.7). BMI and the prevalence of other CVD risk factors was highest in Hispanic and black participants followed by NHW and Asians. Following adjustment for age, sex, BMI, hypertension and diabetes, the statistically significant (p<0.01) difference in sleep duration between black (388.1 min [95% CI: 366.3-40.9]) and NHW participants (435.2, [413.4-457]) remained and Asians had modestly (p<0.10) lower sleep duration (415.5 [390.2-440.8]) compared with NHW. Despite a worse CVD risk profile, there was no difference in sleep duration between Hispanics (425.9 min [403.3, 448.5) and NHW.
Conclusions: Race/ethnic differences in sleep duration are not fully explained by the prevalence of CVD risk factors. The role of social factors and health behaviors on sleep differences should be investigated.
- © 2011 by American Heart Association, Inc.