Table 3. Parent-Offspring Tetrachoric Correlations for MD Across the Major Family Types.
| Relationship by Source of Resemblance | Family Type, Tetrachoric Correlation (95% CI) | Weighted Estimate Across Families, Tetrachoric Correlation (95% CI) | P Value for Test of Heterogeneity Across Families | |||
|---|---|---|---|---|---|---|
| Intact | NLW Father | Stepfather | Adoptive | |||
| Mother-offspring | ||||||
| Genes + rearing | 0.18 (0.18 to 0.19) | 0.18 (0.17 to 0.19) | 0.18 (0.17 to 0.20) | NA | 0.18 (0.18 to 0.18) | .91 |
| Genes only | NA | NA | NA | 0.05 (0.01 to 0.09) | 0.05 (0.01 to 0.09) | NA |
| Rearing only | NA | NA | NA | 0.08 (0.04 to 0.11) | 0.08 (0.04 to 0.11) | NA |
| Father-offspring | ||||||
| Genes + rearing | 0.15 (0.15 to 0.16) | NA | NA | NA | 0.15 (0.15 to 0.16) | NA |
| Genes only | NA | 0.09 (0.07 to 0.10) | NA | 0.05 (−0.01 to 0.11) | 0.08 (0.07 to 0.10) | .18 |
| Rearing only | NA | NA | 0.09 (0.07 to 0.11) | 0.05 (0.00 to 0.10) | 0.08 (0.06 to 0.10) | .18 |
Abbreviations: MD, major depression; NA, not applicable; NLW, not-lived-with.