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Table 1 Current menstrual condition of surveyed schoolgirls (categorized by years after menarche)

From: Prevalence of polycystic ovary syndrome under NIH criteria among the tenth-grade Chinese schoolgirls in Guangzhou area: a cross-sectional epidemiological survey

 

 < 2 years after menarche (n = 84)

3rd year after menarche (n = 275)

 > 3 years after menarche (n = 736)

Regular menstruation [n(%)]

58 (69.0)

218 (79.3)

606 (82.3)b

Irregular menstruation [n(%)]

26 (31.0)

57 (20.7)

131 (17.8)b

Oligo/amenorrhea [n(%)]

24 (28.6)

49 (17.8)a

109 (14.8)b

Cycle length > 90 days [n(%)]

4 (4.8)

3 (1.1)

2 (0.3)b

  1. a,bWhen compared with the group within 2 years after menarche
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BMC Women's Health

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