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Demographics for sample of N = 1,106 twins (503 pairs) during early adolescence
| MZ | DZ | Total | |
|---|---|---|---|
| % female | 61.2% | 48.7% | 53.1% |
| Race | |||
| White | 86.6% | 80.9% | 82.4% |
| Black | 1.6% | 10.9% | 7.9% |
| Multiracial or Other | 11.6% | 8.2% | 9.7% |
| Median Income Category | $70,001-80,000 | $70,001-80,000 | $70,001-80,000 |
| Mean Education in years | |||
| Mother | 14.9 (2.1) | 15.1 (2,4) | 15.0 (2.3) |
| Father | 14.4 (2.2) | 14.3 (2.5) | 14.3 (2.4) |
| Mean age in years (SD mos) | 13.2 (14.8) | 13.0 (14.4) | 13.0 (14.6) |
