Abstract
Purpose To investigate the prevalence and influencing factors of overweight and obesity among primary and secondary school students in Hangzhou city, and provide ideas for the formulation of overweight and obesity prevention and control measures.Methods A total of 353,783 primary and middle school students in 13 districts of Hangzhou city were investigated with physical examination. Using a stratified cluster random sampling method, 6,148 students of primary and junior high school from 24 schools were investigated via questionnaires. Univariate and multivariate logistic regression were used to screen possible risk factors of overweight and obesity.Results The overall overweight and obesity rate was 27.20%, with the increase of the school period, the prevalence of overweight and obesity among students showing downtrend (χ2 = 14.47, P<0.01). The prevalence of overweight and obesity in girls is lower than that in boys (χ2 = 69.79, P<0.01); the prevalence of overweight and obesity in urban students is higher than that in suburban students (χ2 = 2.01, P = 0.02). High blood pressure, had menstruation or nocturnal emission, eating fresh fruit ≥ 1 time a day, daily brushing ≥ 2 times and bullying victimization are independently associated with higher prevalence of overweight and obesity. Moreover, the increased school period, girls and boarding student are protective factors for overweight and obesity.Conclusions The overweight and obesity prevalence among children and adolescents in Hangzhou is still at a relatively high level, and is affected by most factors such as high blood pressure, had menstruation or nocturnal emission, eating fresh fruit frequency, school period and gender, needing targeted intervention measures.