Journal article
Sleep Duration and Area-Level Deprivation in Twins
Sleep (New York, N.Y.), Vol.39(1), pp.67-77
01/01/2016
Handle:
https://hdl.handle.net/2376/115269
PMCID: PMC4678336
PMID: 26285009
Abstract
We used quantitative genetic models to assess whether area-level deprivation as indicated by the Singh Index predicts shorter sleep duration and modifies its underlying genetic and environmental contributions.
Participants were 4,218 adult twin pairs (2,377 monozygotic and 1,841 dizygotic) from the University of Washington Twin Registry. Participants self-reported habitual sleep duration. The Singh Index was determined by linking geocoding addresses to 17 indicators at the census-tract level using data from Census of Washington State and Census Tract Cartographic Boundary Files from 2000 and 2010. Data were analyzed using univariate and bivariate genetic decomposition and quantitative genetic interaction models that assessed A (additive genetics), C (common environment), and E (unique environment) main effects of the Singh Index on sleep duration and allowed the magnitude of residual ACE variance components in sleep duration to vary with the Index.
The sample had a mean age of 38.2 y (standard deviation [SD] = 18), and was predominantly female (62%) and Caucasian (91%). Mean sleep duration was 7.38 h (SD = 1.20) and the mean Singh Index score was 0.00 (SD = 0.89). The heritability of sleep duration was 39% and the Singh Index was 12%. The uncontrolled phenotypic regression of sleep duration on the Singh Index showed a significant negative relationship between area-level deprivation and sleep length (b = -0.080, P < 0.001). Every 1 SD in Singh Index was associated with a ∼4.5 min change in sleep duration. For the quasi-causal bivariate model, there was a significant main effect of E (b(0E) = -0.063; standard error [SE] = 0.30; P < 0.05). Residual variance components unique to sleep duration were significant for both A (b(0Au) = 0.734; SE = 0.020; P < 0.001) and E (b(0Eu) = 0.934; SE = 0.013; P < 0.001).
Area-level deprivation has a quasi-causal association with sleep duration, with greater deprivation being related to shorter sleep. As area-level deprivation increases, unique genetic and nonshared environmental residual variance in sleep duration increases.
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Details
- Title
- Sleep Duration and Area-Level Deprivation in Twins
- Creators
- Nathaniel F Watson - University of Washington Twin Registry, UW, Seattle, WAErin Horn - Department of Psychology, University of Virginia, Charlottesville, VAGlen E Duncan - Departments of Epidemiology and Medicine, UW, Seattle, WADedra Buchwald - Departments of Epidemiology and Medicine, UW, Seattle, WAMichael V Vitiello - Department of Psychiatry and Behavioral Sciences, UW, Seattle, WAEric Turkheimer - Department of Psychology, University of Virginia, Charlottesville, VA
- Publication Details
- Sleep (New York, N.Y.), Vol.39(1), pp.67-77
- Academic Unit
- Community Health; Nutrition and Exercise Physiology, Department of
- Publisher
- United States
- Grant note
- R01AG042176 / NIA NIH HHS K23HL083350 / NHLBI NIH HHS R01 AG042176 / NIA NIH HHS OD006547 / NIH HHS P30NR011400 / NINR NIH HHS
- Identifiers
- 99900547643601842
- Language
- English
- Resource Type
- Journal article