Details of parents (mothers, n=59; fathers, n=54)
| Cohabiting | 91% |
| Interviewed as a couple | 75% (1st interview) |
| 80% (2nd interview) | |
| Age of mothers | |
| <20 | 8% |
| 20–29 | 32% |
| 30–39 | 54% |
| 40+ | 5% |
| Age of fathers | |
| 20–29 | 33% |
| 30–39 | 57% |
| 40+ | 9% |
| Parity of mothers | 31% primigravidae |
| 69% 1–5 previous pregnancies | |
| Previous infertility | 19% |
| Multiple births | 14% |