Sociodemographic characteristics of cohort at different ages
| Sociodemographic variables | Birth (n = 2576)% | 8 months (n = 1752)% | 18 months (n = 1521)% | 3 years (n = 1182)% |
|---|---|---|---|---|
| Biosocial | ||||
| Low birth weight (<2.5 kg) | 8.6 | 7.7 | 7.6 | 8.5 |
| Gestational age (<37 weeks) | 8.4 | 8.0 | 8.0 | 8.0 |
| Parity (primipara) | 39.9 | 42.8 | 42.3 | 43.9 |
| Maternal age (<20) | 6.4 | 5.0 | 5.4 | 4.7 |
| Ethnicity (ISC origin) | 10.8 | 8.4 | 8.3 | 8.8 |
| Health related behaviour | ||||
| Smoking household | 41.6 | 38.5 | 38.8 | 37.6 |
| Socioeconomic status | ||||
| Housing tenure (rented) | 35.3 | 29.7 | 29.1 | 26.0 |
| Maternal education (no qualifications) | 14.0 | 10.7 | 10.7 | 9.6 |
| Marital status (single) | 10.9 | 9.4 | 9.6 | 8.8 |