Comparisons of changes in BMI and waist-height ratio among Chinese Han students from 2010 to 2014

Objective To explore the changes in BMI and waist-height ratio among Chinese Han students aged 7-18 from 2010 to 2014 and to provide basis for preventing central obesity of children and adolescents in China.Methods The data of height,weight and waist circumstances of 229 607 students aged 7-18 years were selected from Chinese National Survey on students Constitution and Health in 2010 and 2014 as object of the study.And we analyzed the changes of BMI and WHtR among Chinese Han students from 2010 to 2014 stratified by sex and urban-rural disparities.Results Compared with 2010,BMI and WHtR increased significantly in 2014 in all ages(P<0.01),group of age 9 observed the most increases(Z=0.15,0.18).Among students aged 7-12,WHtR grew faster than BMI while among the students aged 13-18,it grew more slowly than BMI.For male students,WHtR grew faster than BMI among those aged 8-12 and more slowly in the others;for female students,WHtR grew faster than BMI among those aged 7-9 and more slowly in the others.For urban-rural disparity,though BMI and WHtR in urban students were generally higher than those of rural students,they grow much faster among rural students.WHtR of rural girls aged 12-18 had already beyond urban level.Conclusion In general,the students in primary and mniddle schools increased in BMI and WHtR.WHtR grows a little faster than BMI especially among urban students aged 7-15.WHtR of rural students was growing higher than urban level.