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Table 3 Heritability estimates for smoking initiation, persistence, and quantity in Brazilian families.

From: Genetic analyses of smoking initiation, persistence, quantity, and age-at-onset of regular cigarette use in Brazilian families: the Baependi Heart Study

Smoking Dimension Model h 2 (s.e.), p value σ g 2 σ e 2
Initiation no covariate
age, sex, age2
0.507 (0.106), p < 0.001
0.696 (0.123), p < 0.001
0.832
0.885
0.809
0.385
Persistence no covariate
age
0.285 (0.133), p = 0.0099
0.319 (0.145), p = 0.0066
7.859
6.870
19.676
14.665
Quantity no covariate
age, sex, age × sex, age2
0.234 (0.098), p = 0.0028
0.256 (0.098), p = 0.0012
0.227
0.238
0.745
0.692
  1. h2 (s.e.): heritability estimate (standard error); σ g 2 : polygenic variance estimate; σ e 2 : environmental variance estimate.