Table 3.
Genetic architecture of smoking behavior
| 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 |
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)