Objective :To grasp the prevalence situation of primary and secondary school students’ obesity of Shenzhen and to study the dangerous factors resulted in obesity in order to provide the basis for further preventing and controlling the students’ obesity .Methods :The“BMI classification reference for screening overweight and obesity in Chinese school‐age chil‐dren and adolescents proposed by Working Group on Obesity in China (WGOC )”was used to screen the 3 833 primary school and secondary school students at the age of 8‐16 years in Shenzhen .Among which 195 obese students were picked out to form an “ obesity group” , while another 195 students were chosen to form the “control group” .The behavior factors of the two groups were investigated by the method of closed questionnaire (48 items ) and two rounds analysis were made by using single factor χ2 test and non conditional logistic regression model .Results and Conclusion :7 important factors which were recognized the main reasons re‐sulted in the primary and secondary school students’ obesity were selected :how to describe one’s body weight ,how to control body weight ,the living condition ,time of community sports activities ,mother’ s education level ,how long snacks before bedtime ,the amount of food to eat .That is the main reason causing the behavior of primary and middle school students obesi‐ty .Among them ,the living conditions ,education level of mother ,and body weight describation have not been reported in the previous studies .%研究目的：掌握深圳市中、小学学生肥胖的流行情况，探讨导致肥胖的行为危险因素，为进一步预防与控制学生肥胖提供依据。研究方法：采用中国肥胖问题工作组推出的“中国学龄儿童青少年超重、肥胖筛查BMI值分类标准”，对深圳3833名8～17岁普通学生筛查，确定肥胖学生195名，并选定对照组195名，对肥胖组和对照组的390人采用封闭式问卷（48项），进行行为影响因素调查，应用单因素χ2检验与非条件Logistic回归模型进行两轮分析。结果与结论：筛选出描述自己体重、如何控制体重、居住条件、小区体育活动时间、母亲文化程度、睡前多久加餐、饭量7个因素，并认为是造成中、小学学生肥胖的主要行为原因。其中，母亲文化程度、居住条件和描述自己体重这3个因素在前人的研究中还未见报道。
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