Study On Sleep Time And Obesity Of 8～10 Years Old Students In Urban Zhengzhou

Objective The purpose of this study was to understand the level of sleep time and obesity, and the relationship between sleep time, sleep disorder and prevalence of obesity of primary school students aged 8-10 in Zhengzhou, and to develop practical reference for local children obesity prevention program.Methods Cross-sectional survey and stratified random cluster sampling method was applied. The total of 2500 students aged 8-10 in 10 primary school in four main urban areas of Zhengzhou were sampled. The questionnaires were filled by parents and their children. The hight and weight of child was measured by local CDC. Overweight and/or obesity of boys and girls of all ages were diagnosed based on the classification of China School-age Children Overweight and Obesity Screening BMI which was promulgated in November 2003. EpiData3.0 and SPSS15.0 were used for statistically descriptive analysis, univariate and multivariate and multivariate factorsResults 1. The survey actually covered 2283 children 8-10 years old in urban Zhengzhou. Average sleep time of the children was 9.85±0.83 hours,8.56±0.74 hours-on weekday and 9.06±1.04 hours in the weekends; boys sleep less than girls. Factors affecting children's sleep time were the father's high education level, low family income, obesity, low birth weight, early weaning, frequent oral diseases, gastrointestinal discomfort and daily sporting time.2. Incidence of overweight of the children mentioned above was 22.9%,30.0% for boys and 14% for girls; obesity incidence rate was 9.9%,11.7% for male and 7.9% for female, the incidence rate of obesity and overweight of male was higher than female, the morbidity of obesity was rather equal compared with other domestic medium-sized cities.3. Sleep time of overweight/obese children was shorter than that of normal weight children; BMI was negatively correlated with sleep time (OR=-0.875, P<0.05). Multivariate analysis suggested that higher incidence of children obesity was occurred in the rather better regional economic conditions, male and urban area with shorter sleep time.Conclusions Sleep time of obese children was shorter than normal children in urban Zhengzhou, boys'sleep time was shorter than that of girls; prevalence of childhood obesity and overweight was high, short sleep time was one of the dangerous factor of obesity. So much attention should be paid to children's sleeping time and quality to minimize the risk of obesity and to ensure their healthy physical and mental growth.