Table 3 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 |