Table 4

Association between early menopause and passive exposure to tobacco smoke among never smokers

Variable

% with early menopause and total number that answered

Crude OR

95% CI

Adj. OR ^a

95% CI

%

N

Lower

Upper

Lower

Upper

Hours present in a room where people are smoking

0

7.6

802

Ref.

Ref.

1–6

9.2

76

1.28

0.56

2.94

1.04

0.44

2.44

>6

6.3

16

1.12

0.14

8.99

0.99

0.12

8.12

Smoking mother or father while growing up

No

9.0

378

Ref

Ref.

Yes

6.1

580

1.50

0.90

2.50

1.56

0.92

2.64

Living with smokers after the age of 20

No

7.7

533

Ref.

Ref.

Yes

8.2

417

1.07

0.66

1.73

0.94

0.58

1.54

^a Adjusted for educational level

Mikkelsen et al. BMC Public Health 2007 7:149   doi:10.1186/1471-2458-7-149