They do not mean that you are abnormal if your measurements are smaller or larger.
Most boys have a sense of how the changes in their bodies compare with the changes of other boys their age.
During the event, some 50 women proudly writhed, wiggled and shook their curvy bottoms to get the attention of seven judges.
Gao Qian was awarded 5,000 yuan £568 in cash.
She then put herself under gruelling training to prepare for the contest.