Table 1.
Descriptive Statistics for Adopted and Nonadopted Individuals Included in the Study
| Variable | Adopted (n = 6,311) |
Nonadopted (n = 375,343) |
Nonadopted (Group d; n = 6,500) |
|---|---|---|---|
| Age | M = 56.4, SD = 8.53 | M = 56.7, SD = 8.01 | M = 56.7, SD = 8.06 |
| Sex | 48% male (n = 3,010) | 46% male (n = 172,706) | 46% male (n = 2,978) |
| Years of education | |||
| 7 | 1,209 (19%) | 62,651 (17%) | 1,064 (16%) |
| 10 | 1,780 (28%) | 100,210 (27%) | 1,709 (26%) |
| 13 | 749 (12%) | 43,448 (12%) | 755 (12%) |
| 15 | 350 (6%) | 19,428 (5%) | 354 (5%) |
| 19 | 433 (7%) | 24,300 (6%) | 428 (7%) |
| 20 | 1,790 (28%) | 125,306 (33%) | 2,190 (34%) |
Note: For years of education, both ns and percentages of the subsample are given. Adoptees were compared with the full sample of nonadopted individuals and with our smaller subsample used for genomic analyses (group d).