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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.