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Table 2 Interclass and intraclass correlations in different pairs of relatives for smoking initiation, persistence, and quantity.

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

Type of Relatives Initiation Correlation (s.e.) Persistence Correlation (s.e.) Quantity Correlation (s.e.)
parent:offspring 0.09 (0.04)* 0.18 (0.07)* 0.16 (0.07)*
sibling 0.20 (0.04)*** 0.07 (0.05) 0.12 (0.06)
half-sibling -0.56 (0.25) --- -0.55 (0.39)
grandparent 0.06 (0.08) 0.18 (0.17) -0.08 (0.22)
avuncular 0.01 (0.04) 0.02 (0.05) 0.05 (0.06)
half-avuncular -0.24 (0.28) --- ---
cousin 0.07 (0.04) 0.04 (0.05) 0.11 (0.07)
mother:father 0.24 (0.08)** 0.23 (0.11)* -0.003 (0.123)
  1. s.e.: standard error; * p ≤ 0.05 ** p ≤ 00; *** p ≤ 001.