From: Prevalence of polycystic ovary syndrome under NIH criteria among the tenth-grade Chinese schoolgirls in Guangzhou area: a cross-sectional epidemiological survey
3rd year
4th year
5th year
6th year
NIH-PCOS girls (n)
7
15
12
4
Non-PCOS girls (n)
268
357
267
66
NIH-PCOS prevalence (%)
2.55
4.03
4.30
5.71