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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.