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The figures for middle school, academic high school, and vocational high school were 59.0, 82.4 and 59.7%, respectively ( P < 0.0001).

The overall prevalence of short sleep duration among students was 66.0% (95% CI: 63.8–68.1), higher among girls than boys (69.8% vs. The overall prevalence of obesity and overweight were 3.4% (95% CI: 3.0–3.8) and 7.8% (95% CI: 7.4–8.3), respectively. The mean (SD) height and weight were 166.2 (8.5) cm and 54.6 (11.1) kg, respectively. The mean (SD) age of the students was 15.9 (1.8) years. Weighted multivariable logistic regression models were used for data analyses. Methodsġ8,403 Students in 442 schools were recruited and surveyed using an anonymous, self-administered questionnaires. Our study was designed to determine the prevalence of short sleep duration, and assess the association of sleep duration and obesity, among middle and high school students in Zhejiang, China. The associations between sleep duration and obesity among adolescents in the existing literature are controversial. Understanding factors related to adolescent obesity is critical for prevention of chronic diseases. Obesity has been identified as a major risk factor for a large number of chronic diseases.