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Table 5 Association between pubertal timing and menstrual characteristics and polycystic ovary syndrome (N = 940)

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

 

Crude

Adjusted

OR(95%CI)

R2*

P value

OR (95%CI)

R2*

P value

Age group at thelarche (year)

 

0.006

  

0.095

 

 Normal thelarche (11–13)

Ref.

  

Ref.

  

 Early thelarche (≤ 10)

1.48(1.04, 2.11)

 

0.028

1.37(0.95, 1.99)

 

0.094

 Late thelarche (≥ 14)

1.63(0.63, 4.20)

 

0.311

1.91(0.70, 5.26)

 

0.209

Age group at menarche (year)

 

0.002

  

0.091

 

 Normal menarche (12–15)

Ref.

  

Ref.

  

 Early menarche (< 12)

1.18(0.70, 2.00)

 

0.531

1.23(0.71, 2.15)

 

0.462

 Late menarche (≥ 16)

0.67(0.31, 1.44)

 

0.302

1.02(0.45, 2.31)

 

0.964

Ever diagnosed with precocious puberty

 

0.003

  

0.094

 

 No

Ref.

  

Ref.

  

 Yes

1.67(0.88, 3.17)

 

0.114

1.86(0.93, 3.73)

 

0.079

Regular menstrual cycle in the past 12 months

0.026

  

0.110

  

 No

Ref.

  

Ref.

  

 Yes

0.41(0.28, 0.60)

 

0.000

0.44(0.30, 0.65)

 

0.000

Regular menstrual periods in the past 12 months

 

0.017

  

0.105

 

 No

Ref.

  

Ref.

  

 Yes

0.51(0.36, 0.71)

 

0.000

0.52(0.36, 0.74)

 

0.000

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

 

0.002

  

0.093

 

 Little

Ref.

  

Ref.

  

 Moderate

0.89(0.60, 1.31)

 

0.548

0.82(0.54, 1.24)

 

0.338

 Heavy

0.77(0.42, 1.42)

 

0.403

0.62(0.33, 1.19)

 

0.154

 Heavy with large clots

0.59(0.22, 1.61)

 

0.306

0.59(0.20, 1.71)

 

0.330

Menstrual flow length in the past 12 months (Days)

 

0.000

  

0.091

 

 < 3

Ref.

  

Ref.

  

 3–7

0.77(0.21, 2.84)

 

0.697

0.71(0.18, 2.78)

 

0.626

 > 7

0.83(0.19, 3.60)

 

0.807

0.71 (0.15, 3.28)

 

0.656

  1. Statistically significant values are given in bold
  2. OR, Odds ratio; CI, Confidence interval; R2*, pseudo-R2*; p < 0.05. N was after excluding the participants with missing values in age. Adjusted OR (95%CI) was obtained after adjusting for age, race, education, working hours, and BMI, Body Mass Index.