Table 4 Odds Ratios (OR) and 95% confidence intervals (CI) for being early menopausal on early adulthood characteristics (n = 6805)

BMI at 30/33 (per kg/m2)

0.99

0.96

1.02

Smoking at 30/33

 Never (reference)

1

 Ex-smoker

1.03

0.77

1.39

 Smoker

1.69***

1.28

2.23

Alcohol consumption at 30/33

 Less often or never (reference)

1

 Monthly (one to three times a month)

0.76**

0.57

1.00

 Weekly (once to most days a week)

0.84

0.67

1.06

Exercise at 30/33

 Less often or never (reference)

1

 Monthly (two to three times a month)

1.18

0.79

1.76

 Weekly (once to most days a week)

0.75***

0.60

0.93

Depression symptoms at 30/33

 No (reference)

1

 Yes

1.11

0.83

1.48

Periods or other gynaecological problems by 30/33

 No (reference)

1

 Yes

1.68***

1.36

2.06

Used oral contraceptives by 30/42

 No (reference)

1

 Yes

0.85

0.63

1.16

No live born children by 38/42 (nulliparous)

 No (reference)

1

 Yes

1.13

0.88

1.45

Social class at age 38/42

 Not in paid employment

1.43***

1.13

1.81

 Manual

0.96

0.74

1.24

 Non-manual (reference)

1