Objective: To analyze the relationship between sleep and poor vision of primary and middle school students aged 7-18 years, and to provide evidence for further student eye health promotion. Methods: Data was collected from the Chinese National Survey on Students’ Constitution and Health in 2014. A total of 173 555 primary and middle school students were examined with the 5 m standard visual acuity chart. Sleep, homework time, milk consumption and exercise duration were collected by questionnaire survey. Results: Only 5.60% of students aged 7-18 years had enough sleep, and the poor vision rate among students with insufficient sleep was higher than that of students with sufficient sleep(69.11% vs 67.76%), and the difference is statistically significant(χ2=7.87，P=0.01). After adjusted for other related factors, it showed that students’ sleep was closely related to poor vision(P<0.01), and adequate sleep was the protective factor of students’ poor vision (OR=0.92，95%CI=0.88-0.96). Conclusion Adequate sleep is conducive to preventing the occurrence of poor vision of primary and secondary school students in China. We should take measures to ensure that students get enough sleep.

Objective: To explore the relationship between paternal smoking and risk of childhood obesity , and to provide theoretical support for the identification and intervention of risk factors of obesity among children and adolescents. Methods: Physical examination and questionnaire survey was conducted among 38 228 students from 7 provinces in China. Log-binomial regression model was used to estimate the relationship between passive smoking and childhood obesity. Results: The students were divided into non-smoking goroup and smoking group auording to whether their fathers smoked or not, the former included 19 096 students(50.0%), and the latter included 19 132 students(50.0%). The obesity rate of the no-smoking group was 10.2%, the obesity rate from smoking group was 12.7%, the differences were of statistical significace (χ2=58.42, P<0.01). Univariate analysis showed that the risk for obesity in smoking group was 1.24 times higher than those in non-smoking group (95%CI=1.18-1.32, P<0.05). Adjusting regression indicated that the risk for obesity in smoking group was 1.28. times higher than non-smoking group (95%CI=1.21-1.35, P<0.01). Conclusion Paternal smoking increases the risk of obesity in children and adolescents. Parents should avoid smoking and other unhealthy lifestyle, so as to effectively control the incidence of obesity in children and adolescents.

Objective:To analyze the relationship between insufficient sleep and obesity or central obesity in Chinese Han children and adolescents aged 9-18 years.Methods:A total of 172 710 students who participated in the 2014 Chinese National Survey on Students Constitution and Health with complete data of sleep duration and physical examination, were selected as study subjects. Insufficient sleep was defined, according to the amount of sleep for pediatric populations recommended by the American Academy of Sleep Medicine. Obesity and central obesity of children and adolescents were judged by experts from the Group of China Obesity Task Force and Health Industry Standards in China. Differences between groups were compared by using the t test or χ2 test. Logistic regression method was applied to assess the relationship between insufficient sleep and obesity or central obesity. Results:In 2014, numbers of students with insufficient sleep, obesity and central obesity among Chinese Han children and adolescents aged 9-18 years appeared as 133 410 (77.2 %), 11 145 (6.5 %), and 12 603 (17.8 %), respectively. Among the students with insufficient sleep, 8 358 (6.3 %) were with obesity and 12 244 (17.9 %) were with central obesity. The prevalence of obesity and central obesity among boys with insufficient sleep was higher than that in girls. Pupils with insufficient sleep showed the highest prevalence of obesity and central obesity. After controlling for potential confounders, the risk of obesity appeared an increase of 14.5 % ( OR=1.145, 95 %CI: 1.092-1.200) and the risk of central obesity increased by 12.7 % ( OR=1.127, 95 %CI: 1.078-1.178) in students with insufficient sleep, when compared with those with adequate sleep. Compared with those whose daily sleep duration was less than 6 hours, the ones who slept 7-10 hours per day showed significantly reduction on the risk of obesity and central obesity in students. Conclusions:Insufficient sleep significantly increase the risk of obesity and central obesity in children and adolescents while adequate sleep of 7-10 hours per day would reduce the risk of obesity and central obesity in students.