Table I.
Sample Composition and Demographics
| Study | Mothers | Fathers | Female Offspring | Male Offspring |
|---|---|---|---|---|
| MTFS Male and Female | ||||
| N | 1386 | 1351 | 1379 | 1226 |
| Age Years Mean (SD) | 41.6 (5.3) | 43.8 (6.0) | 17.9 (0.8) | 17.8 (0.6) |
| Years of Education Mean (SD) | 13.7 (1.9) | 13.9 (1.9) | ||
| Occupational Status Mean (SD) | 4.2 (2.0) | 3.9 (1.9) | ||
| MTFS Enrichment Sample | ||||
| N | 497 | 442 | 357 | 299 |
| Age Years Mean (SD) | 41.4 (5.1) | 43.3 (5.7) | 18.0 (0.6) | 17.9 (0.5) |
| Years of Education Mean (SD) | 14.5 (2.0) | 14.4 (2.5) | ||
| Occupational Status Mean (SD) | 2.9 (2.7) | 3.0 (2.0) | ||
| SIBS | ||||
| N | 614 | 550 | 605 | 457 |
| Age Years Mean (SD) | 46.6 (4.2) | 48.2 (4.4) | 18.4 (1.1) | 18.3 (1.0) |
| Years of Education Mean (SD) | 15.1 (2.3) | 15.6 (2.5) | ||
| Occupational Status Mean (SD) | 3.0 (0.5) | 2.4 (0.9) | ||
Note. Occupational status was coded using the Hollingshead (1957) coding system with lower scores indicative of higher status (1 = major profession to 7 = unskilled; 8 was used for participants who were unemployed or homemakers).