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Individual phenotypic correlations between lifetime substance use and family environment variables by zygosity
| Substance | Parental attitudes MZ (DZ) | Household use MZ (DZ) |
|---|---|---|
| Smoking | 0.11 (0.14) | 0.21 (0.19) |
| Alcohol | 0.33 (0.05) | 0.31 (0.16) |
| Marijuana | 0.14 (0.02) | 0.30 (0.20) |
| Cocaine | 0.09 (0.06) | 0.26 (0.20) |
| Stimulant | 0.15 (0.08) | 0.29 (0.20) |
| Sedative | 0.13 (0.05) | 0.30 (0.25) |
| Hallucinogen | 0.18 (0.08) | 0.30 (0.16) |
| Any illicit drug | 0.15 (0.02) | 0.31 (0.21) |
MZ monozygotic twins, DZ dizygotic twins
