Short sleep duration at night in 2.5-year-old children is associated with childhood obesity at age 5.5 years: The Japanese children cohort study |
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Institution: | 1. Public Health, Department of Social Medicine, Osaka University Graduate School of Medicine, Osaka, Japan;2. Polytechnic of Health Ministry of Health Jakarta III, Jakarta, Indonesia;3. Center for International Relations, Osaka University Graduate School of Medicine, Osaka, Japan;4. Division of Community Health & Research, Osaka Women’s and Children’s Hospital, Osaka, Japan;5. Department of Public Health, Faculty of Medicine, Minia University, El-Minia, Egypt;6. Department of Public Health Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan;7. Institute for Global Health Policy Research, Bureau of International Health Cooperation, National Center for Global Health and Medicine, Shinjuku, Tokyo, Japan;8. Public Health, School of Health, Calvin University, Michigan, USA |
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Abstract: | BackgroundObesity in children contributes to higher risks of various chronic diseases in adulthood and the prevalence has increased worldwide including Japan.ObjectivesThis study aims to examine the association between sleep duration at night in children aged 2.5 years and the subsequent risk of obesity at age 5.5 years.MethodsThis study is embedded in the Longitudinal Survey on Babies Born in the 21st Century, which recruited families who had a child born in Japan in 2001. The multivariable logistic regression models were applied to calculate odds ratios (OR) and 95 % confidence intervals (CI) of childhood obesity at 5.5 years, defined as percentage of overweight (POW) ≥ 20 % and body mass index (BMI) ≥ 95th percentile of this study population according to sleep duration at night collected at 2.5 years child age.ResultsAmong 25,378 children, 2.6 % and 3.7 % were obese at age 5.5 years defined by POW and BMI respectively. Compared with night sleep duration > 11 h/d, shorter sleep durations in 2.5 years-old children were associated with higher risk of obesity at 5.5 years; the multivariable ORs (95 %CI) were 1.05 (0.81–1.35), 1.23 (0.93–1.62) and 1.54 (1.04–2.31) for sleep duration 10, 9 and ≤ 8 h/d, respectively; p-trend = 0.03. The observed association differed according to the children (child’s sex, napping habits, and children frequently play at park), and family characteristics (mother’s age at delivery and mother’s level of education).ConclusionShort night sleep duration among girls aged 2.5 years was associated with risk of obesity at age 5.5 years, suggesting the importance of sufficient sleep duration at night for the prevention of obesity. |
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Keywords: | Short sleep Children obesity Sex Daily napping Children characteristics Family characteristics |
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