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Table 3 Association between early menopause and exposure to tobacco smoke

From: Early menopause, association with tobacco smoking, coffee consumption and other lifestyle factors: a cross-sectional study

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
  1. a) Adjusted for educational level
  2. b) Number of cigarettes per year × years smoked