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