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Relevant characteristics of the full- and half-sibling samples
| Relevant variables | Full-siblings | Half-siblings | ||
| Adopted | Reared | Adopted | Reared | |
| Parents (biological), n | 436 | 436 | 2,341 | 2,341 |
| Adoptive families, n | 447 | 447 | 2,374 | 2,347 |
| Age of the parents at birth | ||||
| Mother, mean (SD) | 26.5 (6.4) | 24.8 (5.2) | 22.9 (5.5) | 26.8 (5.7) |
| Father, mean (SD) | 30.4 (7.4) | 28.5 (6.3) | 26.4 (6.9) | 30.1 (7.0) |
| Year of birth, mean (SD) | 1964 (5.8) | 1962 (7.1) | 1963 (5.9) | 1967 (4.6) |
