|
Variable
|
% with early menopause and total number that answered
|
Crude OR
|
95% CI
|
Adj. OR a
|
95% CI
|
|---|
| |
%
|
N
| |
Lower
|
Upper
| |
Lower
|
Upper
|
|---|
|
Number of cigarettes smoked daily
|
|
0
|
7.8
|
966
|
Ref.
| | |
Ref.
| | |
|
1–10
|
9.7
|
610
|
1.24
|
0.86
|
1.78
|
1.17
|
0.81
|
1.68
|
|
>10
|
12.1
|
514
|
1.54
|
1.08
|
2.21
|
1.48
|
1.03
|
2.13
|
|
Total smoking exposure
b
|
|
Low exposure
|
7.2
|
334
|
Ref.
| | |
Ref.
| | |
|
Medium exposure
|
12.1
|
354
|
1.73
|
1.02
|
2.94
|
1.70
|
1.00
|
2.89
|
|
High exposure
|
13.2
|
364
|
1.82
|
1.08
|
3.06
|
1.79
|
1.06
|
3.02
|
|
Age when started daily smoking (current smokers. N = 514)
|
|
<20
|
14.9
|
235
|
Ref.
| | |
Ref.
| | |
|
20–24
|
14.0
|
164
|
0.97
|
0.55
|
1.73
|
0.95
|
0.52
|
1.73
|
|
>24
|
10.5
|
105
|
0.72
|
0.35
|
1.50
|
0.73
|
0.35
|
1.53
|
|
Age when started daily smoking (former smokers. N = 609)
|
|
<20
|
10.5
|
286
|
Ref.
| | |
Ref.
| | |
|
20–24
|
8.1
|
197
|
0.71
|
0.37
|
1.35
|
0.68
|
0.35
|
1.32
|
|
>24
|
6.4
|
110
|
0.58
|
0.25
|
1.37
|
0.59
|
0.25
|
1.40
|
|
Number of years before the age of menopause one stopped smoking (former smokers. N = 609)
|
|
Smoking at the time of menopause
|
16.9
|
195
|
Ref
| | |
Ref.
| | |
|
1–10
|
11.9
|
135
|
0.74
|
0.39
|
1.42
|
0.68
|
0.35
|
1.32
|
|
>10
|
2.3
|
256
|
0.14
|
0.06
|
0.34
|
0.13
|
0.05
|
0.33
|
- a) Adjusted for educational level
- b) Number of cigarettes per year × years smoked
