Sample Characteristics
| 1960 Census Unweighted | Providence and Boston Unweighted | Cortisol Sample Unweighted | Sibling Sample | ||
|---|---|---|---|---|---|
| Unweighted | Weighted | ||||
| Maternal education | 11.5 | 11.4 | 11.07 | 11.4 | 11.6 |
| Family income ($2010) | $37,971 | $26,013 | $24,403 | $26,233 | $35,113 |
| Mother black | 0.03 | 0.12 | 0.13 | 0.08 | 0.03 |
| Maternal age | 30.6 | 25.2 | 24.9 | 24.6 | 25.4 |
| Mother single | 0.03 | 0.11 | 0.09 | 0.056 | 0.024 |
| Birth weight (grams) | — | 3,185 | 3,307 | 3,290 | 3,303 |
| Gestation (weeks) | — | 36.8 | 40.1 | 39.9 | 40 |
| Free cortisol (ng/ml) | — | — | 24 | 22 | 20.5 |
| Verbal IQ seven year | — | 99.9 | 99.2 | 100.2 | 101.8 |
| Adult education | — | — | 13.1 | 13.2 | 13.3 |
| Severe chronic condition seven year | — | — | 0.089 | 0.099 | 0.099 |
| Observations | — | 17,921 | 1,058 | 320 | 320 |