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Sleep Med. 2015 Feb;16(2):243-9. doi: 10.1016/j.sleep.2014.11.010. Epub 2014 Dec 12.

Ethnic-specific associations of sleep duration and daytime napping with prevalent type 2 diabetes in postmenopausal women.

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San Diego State University/University of California, San Diego Joint Doctoral Program in Public Health (Epidemiology), CA, United States; Graduate School of Public Health, San Diego State University, Hardy Tower Room 119, 5500 Campanile Drive, San Diego, CA 92182-4162, United States. Electronic address:
Department of Family Medicine and Public Health, School of Medicine, University of California, San Diego, 9500 Gilman Drive, Mail code: 0607, La Jolla, CA 92093-0607, United States.
San Diego County Health and Human Services Agency, Health Services Complex, 3851 Rosecrans Street, Mail stop: P-578, San Diego, CA 92110-3134, United States.



The objective of this study was to evaluate ethnic differences in the associations of nighttime sleep and daytime napping durations with prevalent type 2 diabetes.


Samples of White (n = 908), Filipina (n = 330), and Black (n = 371) community-dwelling, postmenopausal women aged 50-86 years were evaluated with cross-sectional data obtained during 1992-1999 including self-reported duration of nighttime sleep and daytime napping, behaviors, medical history, and medication use. The prevalence of type 2 diabetes was evaluated with a 2-h 75-g oral glucose tolerance test.


Overall, 10.9% of White, 37.8% of Filipina, and 17.8% of Black women had type 2 diabetes. Average sleep durations were 7.3, 6.3, and 6.6 h and napping durations were 16.8, 31.7, and 25.9 min for White, Filipina, and Black women, respectively. Sleep duration showed a significant (p < 0.01) nonlinear association with type 2 diabetes in Filipina women, with increased odds of diabetes at both low and high sleep durations independent of age, body mass index (BMI), triglyceride to high-density lipoprotein (HDL) ratio, hypertension, and daytime napping duration. Daytime napping duration was associated with type 2 diabetes only among White women; those napping ≥ 30 min/day had 74% (95% confidence interval (CI) = 10%, 175%) higher odds of diabetes compared to non-nappers independent of covariates including nighttime sleep duration.


Results suggest ethnic-specific associations of nighttime sleep and daytime napping durations with type 2 diabetes.


Diabetes; Ethnic differences; Nap duration; Napping; Postmenopausal; Sleep duration

[Indexed for MEDLINE]

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