Li Hui, Zong Xin-nan, Ji Cheng-ye, Mi Jie
Department of Growth and Development, Capital Institute of Pediatrics, Beijing 100020, China.
Zhonghua Liu Xing Bing Xue Za Zhi. 2010 Jun;31(6):616-20.
To study the body cut-offs of mass index (BMI) for the purpose of screening overweight and obesity for Chinese children and adolescents aged 2 - 18 years.
Based on the BMI growth reference values for Chinese children aged 0 - 18, using the common methods to establish the BMI cut-offs for screening overweight and obesity. These methods were having the same empirical percentile or Z scores and the BMI value at 18 years consistent with adults. Three sets of BMI cut-offs, including (BMI₂₄, BMI₂₈), (P₈₅, P₉₅) and (Z₁, Z₂), were initially identified. Differences were compared on different cut-off points and prevalence rates of overweight and obesity with different BMI reference, different values and "prevalence" of overweight and obesity based on "2004 Beijing Child and Adolescent Metabolic Syndrome Study". Cut-offs standards which recommended by the Chinese Working Group on Obesity for Children (WGOC) and by the International Obesity Task Force (IOTF) were also used. Finally the appropriate cut-offs were defined.
Three sets of BMI cut-offs for screening overweight and obesity for Chinese children and adolescents aged 2 - 18 years were obtained according to the above mentioned methods for selection. The prevalence rates of overweight and obesity defined by those cut-offs appeared not to be significantly different. Compared with the WGOC, the BMI cut-off points for screening overweight and obesity for both boys and girls from our study were very close to the WGOC', but cut-off points for screening overweight for girls aged 8.5 - 15.5 y was 0.3 - 1.0 kg/m² lower than the WGOC'. Going through the database on screening of "2004 Beijing Children's Metabolic Syndrome Survey", the prevalence of overweight for girls was about 3.4% higher than using the cut-offs of WGOC.
Results from this study suggested that the BMI cut-offs passed through the cut-off point of BMI₂₄ and BMI₂₈ at 18 years was appropriate for screening overweight and obesity in Chinese children from 2 to 18 years, and achieved the continuity in age and consistency in screening standard when using the BMI indicator in children and adolescents.
研究2至18岁中国儿童及青少年超重与肥胖筛查的体质指数（BMI）界值。
基于0至18岁中国儿童BMI生长参考值，采用通用方法建立超重与肥胖筛查的BMI界值。这些方法包括具有相同的经验百分位数或Z分数，以及18岁时的BMI值与成年人一致。初步确定了三组BMI界值，包括（BMI₂₄，BMI₂₈）、（P₈₅，P₉₅）和（Z₁，Z₂）。根据“2004年北京儿童与青少年代谢综合征研究”，比较了不同界值点以及不同BMI参考值下超重与肥胖的患病率、超重与肥胖的不同数值及“患病率”。还使用了中国儿童肥胖问题工作组（WGOC）和国际肥胖特别工作组（IOTF）推荐的界值标准。最后确定了合适的界值。
根据上述选择方法，得出了2至18岁中国儿童及青少年超重与肥胖筛查的三组BMI界值。由这些界值定义的超重与肥胖患病率似乎没有显著差异。与WGOC相比，本研究中男孩和女孩超重与肥胖筛查的BMI界值点与WGOC的非常接近，但8.5至15.5岁女孩超重筛查的界值点比WGOC的低0.3至1.0kg/m²。查阅“2004年北京儿童代谢综合征调查”筛查数据库，女孩超重患病率比使用WGOC界值时高约3.4%。
本研究结果表明，经过18岁时BMI₂₄和BMI₂₈界值点的BMI界值适用于2至18岁中国儿童超重与肥胖的筛查，并且在儿童和青少年使用BMI指标时实现了年龄上的连续性和筛查标准的一致性。
