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Table 2 Odds Ratios (OR) and 95% confidence intervals (CI) for being early menopausal on birth characteristics (n = 6805)

From: Risk factors for natural menopause before the age of 45: evidence from two British population-based birth cohort studies

Birth characteristics

OR

95% CI

Father’s social classa

 No father in household/Other

2.20***

1.48

3.28

 Manual

2.02***

1.61

2.54

 Non-manual (reference)

1

  

Mother smoked during pregnancyb

 No (reference)

1

  

 Stopped prior or during the pregnancy

0.77

0.50

1.18

 Smoked during pregnancy

1.24*

1.03

1.49

Maternal age at birthc

 19 or less years

1.25

0.90

1.74

 20–34 years (reference)

1

  

 35 or more years

1.13

0.85

1.48

Birthweight standardized for gestationd

 1st quarter (lowest)

1.01

0.78

1.30

 2nd quarter

0.91

0.70

1.18

 3rd quarter (reference)

1

  

 4th quarter (highest)

1.05

0.80

1.39

Breastfede

 Less than 1 month

1.30*

1.05

1.60

 1 or more months (reference)

1

  
  1. This table presents selected coefficients for being early menopausal on birth characteristics. Full results are presented in Supplementary material (Additional file 1: Table 4)
  2. An asterisk indicates significance levels, *** p < 0.001, * p < 0.05
  3. Adjusted for:
  4. a Cohort year
  5. b Father’s social class, and cohort year
  6. c Father’s social class, maternal smoking during pregnancy, birthweight standardized for gestational age, and cohort year
  7. d Father’s social class, maternal smoking during pregnancy, maternal age at birth, and cohort year
  8. e Father’s social class, maternal smoking during pregnancy, maternal age at birth, birthweight standardized for gestational age, and cohort year