|
Association between early menopause and exposure to tobacco smoke |
||||||||
| 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 | ||||||||
Mikkelsen et al. BMC Public Health 2007 7:149 doi:10.1186/1471-2458-7-149 |
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