title: Associations between Sleep Duration and Overweight/Obesity: Results from 66,817 Chinese Adolescents.
abstract: The findings about the shapes of associations between sleep duration and overweight/obesity in adolescents were largely inconsistent in the existing literature. We examined the functional forms of the associations between sleep duration and overweight/obesity in 66,817 Chinese adolescents by modelling sleep duration categorically and continuously. The adjusted ORs (95% CI) of overweight (with 7.0-8.9 h of sleep being considered the reference group) for subjects reporting <5.0 hours, 5.0-6.9 hours and ≥9.0 hours of sleep were 1.26 (1.05-1.51), 1.06 (1.00-1.11) and 1.27 (1.14-1.42), respectively. The adjusted ORs (95% CI) of obesity (with 7.0-8.9 h of daily sleep being considered as the reference group) for adolescents reporting <5.0 hours, 5.0-6.9 hours and ≥9.0 hours of sleep were 1.24 (0.97-1.57), 0.94 (0.87-1.01) and 1.42 (1.24-1.63), respectively. Continuous splines regressions support non-linear U shape associations between sleep duration and overweight/obesity, with the bottom at around 7.0-8.0 hours sleep (overweight: likelihood ratio = 32.7 p < 0.01; obesity: likelihood ratio = 40.4 p < 0.01). U-shape associations were found between sleep duration and overweight/obesity in Chinese adolescents and an optimal sleep duration of 7.0-8.0 hours sleep may prevent overweight/obesity.
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.|UCLA Fielding School of Public Health, University of California Los Angeles, Department of Epidemiology, Los Angeles, 90066 United States of America.
authors.forename: Jie
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.
authors.forename: Hong
authors.initials: H
authors.lastname: Wu
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.
authors.forename: Lan
authors.initials: L
authors.lastname: Guo
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.
authors.forename: Xueqing
authors.initials: X
authors.lastname: Deng
authors.affiliation: School of Public Health, Sun Yat-sen University, Department of Medical Statistics and Epidemiology Guangzhou, 510080 China.
authors.forename: Ciyong
authors.initials: C
authors.lastname: Lu
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D009765:Obesity / Q000453:epidemiology*; D016017:Odds Ratio; D050177:Overweight / Q000453:epidemiology*; D012044:Regression Analysis; D012307:Risk Factors; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires; D013997:Time Factors