Table 1.
Description of the Sample
| Group | n | Mean age at intake (SD) |
Mean age at third follow-up (SD) |
|---|---|---|---|
| Parents | |||
| Mothers | 287 | 46.6 (4.2) | 63.9 (4.8) |
| Fathers | 205 | 48.2 (4.4) | 65.4 (4.7) |
| Adopted offspring | |||
| Female | 237 | 15.0 (2.1) | 32.6 (2.9) |
| Male | 133 | 14.9 (1.7) | 31.7 (2.5) |
| Biological offspring | |||
| Female | 189 | 14.9 (2.0) | 31.6 (2.5) |
| Male | 121 | 14.9 (1.8) | 31.1 (2.6) |
Note: The sample for the current study was a subset of the Sibling Interaction and Behavior Study. The table includes only participants with valid scores for political ideology. Valid sample size for other phenotypes analyzed are within ±3 of this reported sample size. Ages are given in years.