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Relevant correlations of the full- and half-sibling samples
| Correlated variables | Correlations (SE) | |
| Full-siblings | Half-siblings | |
| IQ–education bio parents (all) | 0.28 (0.05) | 0.24 (0.01) |
| IQ–education bio parents (reared) | 0.34 (0.04) | 0.29 (0.02) |
| IQ–education bio parents (adopted) | 0.20 (0.05) | 0.18 (0.02) |
| IQ–education adoptive parents | 0.18 (0.05) | 0.18 (0.02) |
| Education adoptive parents–education bio parents | 0.18 (0.05) | 0.20 (0.02) |
