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Table 3 Genetic architecture of smoking behavior

From: Interplay between heritability of smoking and environmental conditions? A comparison of two birth cohorts

  1993-1995 2009-2010 Combined
(1993-1995 &
2009-2010)
  Estimate 95% CI Estimate 95% CI Estimate 95% CI
Man:       
Genetic factors .62 .23-.86 .67 .00 - .90 .66 .29 - .86
Shared environment .19 .01-.53 .06 .00 - .66 .14 .00 - .46
Unique environment .18 .10-.30 .26 .09 - .57 .20 .12 - .30
Woman:       
Genetic factors .15 .00-.49 .34 .00 - .84 .21 .00 - .49
Shared environment .62 .32-.80 .46 .00 - .79 .57 .32 - .77
Unique environment .23 .15-.33 .20 .10 - .34 .22 .15 - .30
  1. Estimates for the contribution of additive genetic, common environmental and unique environmental factors to the variance in smoking in 18-25 year old twins in 1993-1995 and 2009-2010 and in the combined sample (full model)