20-year trends in prevalence of overweight and obesity among children aged 0-6 in Harbin, China: A multiple cross-sectional study

To examine the 20-year trends in the combined prevalence of overweight and obesity among children aged 0–6 years between 1995 and 2015 in Harbin, China, we selected altogether 49,553 children aged 0–6 years old by using a multistage stratified cluster sampling methods in Harbin, one provincial capital city in northeast China in 1995, 2005 and 2015. Height and weight information of the children were collected. We used the child growth standards of World Health Organization to calculate the Z-scores for body mass index (BMI). Cut-offs recommended by World Health Organization and International Obesity Task Force were used to define overweight and obesity for each children. We found there is no difference between boys’ BMI and girls’ among newborns in each survey point (p>0.05), but in older age groups, the BMI of boys was higher than that of girls (ppp为探究中国哈尔滨1995年至2015年间0~6岁儿童超重与肥胖合并患病率的20年变化趋势，我们于1995年、2005年及2015年，在中国东北省会城市哈尔滨，采用多阶段分层整群抽样（multistage stratified cluster sampling）方法，共纳入49553名0~6岁儿童。本研究收集了受试儿童的身高与体重数据，采用世界卫生组织（World Health Organization, WHO）的儿童生长标准，计算每名儿童的体重指数（Body Mass Index, BMI）Z评分，并依据世界卫生组织及国际肥胖工作组（International Obesity Task Force, IOTF）推荐的截断值，对每名儿童的超重与肥胖状态进行界定。研究发现，各调查时点的新生儿群体中，男童与女童的BMI无统计学差异（p>0.05）；但在年龄较大的组别中，男童的BMI水平高于女童（ppp