The Comparison Between Percents Of Overweight And Obesity Assessed By Different Body Mass Index (BMI) Standards In Chinese Children And Adolescent

Objective:At present,the overweight and obesity of children and adolescents has gradually become a worldwide public health problem in developed and developing countries,childhood obesity rates are rising rapidly.The standards of International Obesity Task Force(IOTF) and the World Health Organization(WHO) are most extensive international standards in evaluating the overweight and obesity of children and adolescents,the Working Group on Obesity in China(WGOC) in 2003 and launched its own BMI standards.These standards have different reference population and overweight,obesity cutoff points.In this study,by using the IOTF,WHO and WGOC standards to screen the overweight and obesity of children and adolescents in China,to compare the differences between IOTF,WHO and WGOC standards,test the feasibility of IOTF and WHO standards in the promotion of Chinese,and know the differences between north and south of overweight and obesity children and adolescents in China.Provide a better theoretical basis test in screening overweight and obesity children and adolescents.Method:Select the "carpal manpower development of the Chinese standards - Chinese 05" standard samples of 7-18 year-old Chinese children and adolescents,10,581.including Male:7-18 years old,5095;Female:7-18 years old,5486.Sample of cities are Shanghai, Wenzhou,Guangzhou,Dalian,Shijiazhuang.Every age group,stratified cluster sampling. Children in each age group measure the height and weight before and after birth within 15 days.Devided with gender,age,and the North-South sub-region,and use IOTF,WHO and the WGOC standards screen all groups,use chi-square compare the difference of ITOF,WHO and WGOC standards,use WGOC as the "gold standard" to calculate the sensitivity and specificity of ITOF and WHO standards.Resoult:The WGOC standard screen male,female overweight rates are male 15.9%,female 10.5%,and North male,female overweight rates are 18.7%,17.2%,and South male,female overweight rates are 14.0%,9.1%;the WGOC standard screen male,female obsity rates are male 10.8%,female 6.0%,and North male,female overweight rates are 15.2%,9.3%,and South male,female overweight rates are 7.9%,3.8%.The IOTF standard screen male,female overweight rates are male 17.8%,female 11.9%,and North male,female overweight rates are 21.3%,14.7%,and South male,female overweight rates are 15.5%,9.7%;the IOTF standard screen male,female obsity rates are male 6.7%,female 2.9%,and North male,female overweight rates are 10.1%,4.9%,and South male,female overweight rates are 4.4%,1.3%. The WHO standard screen male,female overweight rates are male 11.3%,female 9.8%,and North male,female overweight rates are 14.1%,11.3%,and South male,female overweight rates are 9.8%,8.6%;the WHO standard screen male,female obsity rates are male 6.3%, female 1.5%,and North male,female overweight rates are 8.7%,3.5%,and South male, female overweight rates are 2.7%,1.1%.IOTF and WHO standards screen overweight rate of children and adolescents in China are different with WGOC standard between the ages of 9-14 and has a statistical significance(P＜0.05),and the IOTF and WHO standards screen obesity rate of children and adolescents in China are lower than WGOC standard and has a statistical significance(P＜0.05).The IOTF standard screen overweight males sensitivity and specificity are 0.863,0.956,obesity males sensitivity and specificity are 0.632,1;screen overweight females sensitivity and specificity are 0.815,0.963,obesity males sensitivity and specificity are 0.521,1.The WHO standard screen overweight males sensitivity and specificity are 0.763,0.923,obesity males sensitivity and specificity are 0.612,1;screen overweight females sensitivity and specificity are 0.786,0.906,obesity males sensitivity and specificity are 0.482,1.Conclusion:Results of IOTF,WHO and WGOC standards screen Chinese children and adolescents overweight and obesity showed that there is an age,gender identity,overweight and obesity rates for boys higher than girls,overweight and obesity rates have peak during 9-14 at the puberty;IOTF and WHO standards screen the overweight rates of Chinese children and adolescents have significant differences with WGOC results mainly in the 9-14 years old,IOTF and WHO standards screen obesity rate have significant differences with WGOC standard.IOTF and WHO standards may underestimate overweight and obesity of Chinese children and adolescents;IOTF,WHO and WGOC standards screen overweight and obesity of South and North Chinese children and adolescents indicate that overweight and obesity of children and adolescents in North higher than South.