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ABSTRACT: Study objective
The trend in sleep duration in the United States population remains uncertain. Our objective was to examine changes in sleep duration from 1985 to 2012 among US adults.Design
Trend analysis.Setting
Civilian noninstitutional population of the United States.Participants
324,242 US adults aged ≥ 18 y of the National Health Interview Survey (1985, 1990, and 2004-2012).Measurements and results
Sleep duration was defined on the basis of the question "On average, how many hours of sleep do you get in a 24-h period?" The age-adjusted mean sleep duration was 7.40 h (standard error [SE] 0.01) in 1985, 7.29 h (SE 0.01) in 1990, 7.18 h (SE 0.01) in 2004, and 7.18 h (SE 0.01) in 2012 (P 2012 versus 1985 < 0.001; P trend 2004-2012 = 0.982). The age
SUBMITTER: Ford ES
PROVIDER: S-EPMC4402659 | biostudies-literature | 2015 May
REPOSITORIES: biostudies-literature