Metrics
Minnesota Transratial study 1992
Comparison of Cognitive Performance Measures at Ages 7 and 17 in Children, All Reared in Middle-Class White Families. From “The Minnesota Transracial Adoption Study: A Follow-Up of TQ Test P Scarr, and I. D. Waldman, 1992, Intelligence, 16, pp. 117-135.
| Children’s background | Age 7 IQ | Age 17 IQ |
|---|---|---|
| Biological Parents (White kids) | 120 | 115 |
| Nonadopted, with two White biological parents (N at age 7 = 143; N at 17 = 104) | 117 | 109 |
| Adopted, with two White biological parents (N at age 7 = 25; N at 17 = 16) | 112 | 106 |
| Adopted, with one White and one Black biological parent (N at age 7 = 68; N at 17 = 55) | 109 | 99 |
| Adopted, with two Black biological parents (N at age 7 = 29, N at 17 = 21) | 97 | 89 |