Age-specific prevalence of obesity and 95% confidence intevals (CI) in the Chinese urban boys (left figure) or girls (right figure) from 1985 to 2010.

Note: In most subgroups, the increasing trends in the prevalence of obesity were statistically significant, and 95%CI of each two adjacent years were not overlapped. In recent five years, there was no significant difference in girls of 13∼15 and 16∼18 year subgroups and boys of 16∼18 year subgroup. The increasing trend was observed in both boys and girls, but the increase values in girls were less than that in boys.