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Table 4 Association between early menopause and passive exposure to tobacco smoke among never smokers

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
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
  1. a Adjusted for educational level