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Table 2 Pubertal timing and menstrual characteristics (N = 977)

From: Current situation of menstruation and gynecological diseases prevalence among Chinese women: a cross-sectional study

 

Mean ± SD or N (%)

Age at thelarche (year)

11.24 ± 1.36

 Range (year)a

11–15

Age groups at thelarche (year)

 

 Early thelarche (≤ 10)

267 (27.33)

 Normal thelarche (11–13)

683 (69.91)

 Late thelarche (≥ 14)

27 (2.76)

Age at menarche

13.19 ± 1.44

 Range (year)a

9–17

Age group at menarche (year)

 

 Early menarche (< 12)

94 (9.62)

 Normal menarche (12–15)

820 (83.93)

 Late menarche (≥ 16)

63 (6.45)

Ever diagnosed with precocious puberty

 

 No

924 (94.58)

 Yes

53 (5.42)

Regular menstrual cycle in the past 12 months

 

 No

593 (60.70)

 Yes

384 (39.30)

Regular menstrual periods in the past 12 months

 

 No

337 (34.49)

 Yes

640 (65.51)

Menstrual quantity in the past 12 months (amount of bleeding)

 

 Little

225 (23.03)

 Moderate

609 (62.33)

 Heavy

105 (10.75)

 Heavy with large clots

38 (3.89)

Menstrual flow length in the past 12 months (days)

5.90 ± 1.42

 Range

1–12

Menstrual flow length in the past 12 months (days)

 

 < 3

14 (1.43)

 3–7

912 (93.35)

 > 7

51 (5.22)

  1. SD, standard deviation
  2. aMinimum–Maximum