Abstract: Objective To describe the trend of obesity prevalence in children under the new criteria of "Overweight and Obesity Screening for School-age Children and Adolescents",So as to provide clues for intervention and prevention. Methods Totally 929 students were selected as the subjects in September 2018.The trends of obesity prevalence and body mass index Z(BMI-Z) score were described from the first grade of primary school (7 years old) to the first grade of junior middle school (13 years old). Results The average age of the subjects ranged from 6.91 to 13.58 years old.Under the new criteria,the prevalence of obesity and prevalence of overweight or obesity in the first grade of primary school (seven years old) were at a peak,the prevalence of obesity was as high as 28.52% among boys,15.59% among girls.In general,the prevalence of obesity,overweight or obesity decreased with age among both boys and girls.The prevalence of obesity decreased from 28.52% to 15.55%,and the prevalence of overweight or obesity decreased from 48.83% to 39.68% among boys.The prevalence of obesity decreased from 15.59% to 8.56% and the prevalence of overweight or obesity decreased from 33.81% to 21.66% among girls.BMI-Z score showed a trend of increasing firstly and then decreasing slightly (the peak point was in the fifth grade of primary school). Conclusions Under the new criteria,the obesity situation of primary school students is severe,especially in the first grade of primary school,which is the peak period of obesity.This strengthens the urgency of childhood obesity prevention work.Primary school as an important barrier for childhood obesity intervention,should be further strengthened.

Key words: children, obesity, BMI-Z score, screening, criteria

摘要： 目的 本研究旨在描述《学龄儿童青少年超重与肥胖筛查》新标准下儿童肥胖率变化趋势,为开展干预及预防工作提供线索。方法 本研究于2018年9月选取前期群组随机对照试验研究中对照组学生929人作为研究对象,描述研究对象从小学一年级(7岁)至初中一年级(13岁)肥胖、超重、超重或肥胖检出率及体重指数Z分值(BMI-Z)变化趋势。结果 研究对象平均年龄范围6.91~13.58岁。“新”标准下,小学一年级(7岁时)肥胖率、超重或肥胖率均处于高峰,男生肥胖率已高达28.52%,女生为15.59%。总体上,随年龄增长,男、女生肥胖率、超重或肥胖率呈降低趋势;男生肥胖率、超重或肥胖率分别从28.52%、48.83%降低为15.55%和39.68%;女生肥胖率、超重或肥胖率分别从15.59%、33.81%降低为8.56%和21.66%。 男、女生BMI-Z分值均呈现先增高后稍下降的趋势(小学五年级为峰值点)。结论 “新标准”下,小学生肥胖形势严峻,尤其是小学一年级,是肥胖发生的高峰期,这增加了儿童肥胖预防工作的紧迫性。小学作为儿童肥胖干预的重要关口应进一步加强其肥胖的干预。

关键词: 儿童, 肥胖, BMI-Z分值, 筛查, 标准