Table 1.
Baseline characteristics of the 2,365 studied orphan/MNO pairs
| Variable | Prenatal orphans (n = 656) | MNOs (n = 656) | Postnatal orphans (n = 1,709) | MNOs (n = 1,709) |
| Date of birth, mean | 28 April 1915 | 27 April 1915 | 1 April 1915 | 2 April 1915 |
| Sex, n (%) | ||||
| Female | 319 (48.6) | 319 (48.6) | 814 (47.6) | 814 (47.6) |
| Male | 337 (51.4) | 337 (51.4) | 895 (52.4) | 895 (52.4) |
| Legitimacy, n (%) | ||||
| Legitimate | 630 (96.0) | 552 (84.1) | 1,509 (88.3) | 1,413 (82.7) |
| Illegitimate | 26 (4.0) | 104 (15.9) | 200 (11.7) | 296 (17.3) |
| Paternal OS (95% CI) | 2.60 (2.46, 2.74) | 2.70 (2.58, 2.82) | 2.62 (2.55, 2.69) | 2.75 (2.68, 2.83) |
| Maternal OS (95% CI) | 4.42 (4.26, 4.59) | 4.70 (4.53, 4.86) | 4.44 (4.34, 4.54) | 4.62 (4.52, 4.72) |
| Maternal age, mean (SD) | 25.8 (4.3) | 26.2 (4.5) | 25.6 (4.9) | 26.4 (5.0) |
| Paternal age, mean (SD) | 28.7 (4.3) | 30.4 (5.7) | 28.5 (4.9) | 30.6 (6.2) |
| Status at age 99, n (%) | ||||
| Dead | 630 (96.0) | 637 (97.1) | 1,645 (96.3) | 1,632 (95.5) |
| Alive | 26 (4.0) | 19 (2.9) | 64 (3.7) | 77 (4.5) |
OS, occupation score (Methods).