Table 1.
Characteristics of participants included in study models
| Variables | Participants n (%) |
|---|---|
| Maternal education (years) (n = 4053) | |
| 0–4 | 621 (15.3) |
| 5–8 | 1668 (41.2) |
| ≥9 | 1764 (43.5) |
| Family income (minimum wage) (n = 4041) | |
| ≤1.0 | 844 (20.9) |
| 1.1–3.0 | 1872 (46.3) |
| 3.1–6.0 | 919 (22.7) |
| 6.1–10.0 | 223 (5.5) |
| >10.0 | 183 (4.5) |
| Marital status (n = 4053) | |
| Lived with partner | 3398 (83.8) |
| Single mother | 655 (16.2) |
| Maternal skin colour (n = 4053) | |
| White | 2964 (73.1) |
| Black/mixed | 1089 (26.9) |
| Maternal age (years) (n = 4051) | |
| ≤19 | 771 (19.0) |
| 20–34 | 2748 (67.8) |
| ≥35 | 532 (13.1) |
| Parity (n = 4053) | |
| 0 | 1592 (39.3) |
| 1 | 1073 (26.5) |
| ≥2 | 1388 (34.3) |
| Maternal smoking during pregnancy (n = 4053) | |
| No | 2945 (72.7) |
| Yes | 1108 (27.3) |
| Child's sex (n = 4053) | |
| Male | 2106 (52.0) |
| Female | 1947 (48.0) |
| Mean (SD) | |
|---|---|
| Maternal height (m) (n = 3974) | 1.59 (0.06) |
| Gestational age (weeks) (n = 4045) | 38.63 (2.26) |
| Duration of breast feeding (months) (n = 3772) | 9.94 (8.90) |