Table 1 Demographic characteristics of the study sample (N = 698)
Characteristic | Included in final analysis (n = 612) | Excluded because of missing data (n = 86) | |
|---|---|---|---|
Maternal | Â | Â | Â |
|  | Mean age (years ± SD) | 30.3 ± 5.2 | 28.6 ± 5.7 |
| Â | Education, n (%) | Â | Â |
|  |    Tertiary | 365 (59.6%) | 41 (47.7%) |
|  |    Trade or Technical college | 141 (23.0%) | 19 (22.1%) |
|  |    Secondary | 106 (17.3%) | 26 (30.2%) |
|  | Incomeπ |  |  |
|  |    0 ≤ $70,000 | 276 (46.1%) | 35 (52.2%) |
|  |    > $70,000 | 323 (53.9%) | 32 (47.8%) |
| Â | BMI kg/m2, n (%) | Â | Â |
|  |    Underweight (<18.5) | 14 (2.3%) | 0 (%) |
|  |    Normal weight (18.5-24.9) | 299 (49.1%) | 36 (44.4%) |
|  |    Overweight (25.0-29.9) | 193 (31.7%) | 24 (29.6%) |
|  |    Obese (≥30) | 103 (16.9%) | 21 (25.9%) |
| Â | Maternal smoking during pregnancy, n (%) | Â | Â |
|  |    Yes | 71 (11.6%) | 14 (16.7%) |
|  |    No | 541 (88.4%) | 70 (83.3%) |
Infant | Â | Â | Â |
|  | Mean birthweight (kg ± SD) | 3.5 ± 0.4 | 3.5 ± 0.4 |
|  | Mean age at assessment (months ± SD) | 4.3 ± 1.0 | 4.5 ± 1.0 |
| Â | Gender | Â | Â |
|  |    Male | 305 (49.8%) | 39 (45.3%) |
|  |    Female | 307 (50.2%) | 54 7%) |