Table 1. Sample characteristics for full-term and perinatal risk (PR) groups.
| Full-term | Mild PR | Moderate-to-high PR | P for the trend | |
|---|---|---|---|---|
| (71.1%) | (21.5%) | (7.4%) | ||
| Baseline characteristics (time 1) | % | % | % | |
| Singleton birth (versus multiple) | 99.0 | 96.3 | 95.7 | 0.002 |
| Child female | 48.8 | 48.7 | 52.1 | 0.65 |
| Non-smoking pregnancy | 55.7 | 39.8 | 36.2 | <0.001 |
| No alcohol used in pregnancy | 78.9 | 72.5 | 68.1 | 0.003 |
| Maternal education Year 12 or above a | 46.6 | 40.7 | 35.0 | 0.02 |
| Mother Aboriginal or Torres Strait Islander | 80.3 | 87.8 | 87.2 | 0.005 |
| Accessible geographical location | 81.4 | 75.6 | 74.5 | 0.02 |
| Characteristics averaged over the assessments (times 1–4) | ||||
| Child age in months (mean, se) | 45.78 (0.36) | 48.57 (0.71) | 47.22 (1.26) | 0.35 |
| Mother age in years (mean, se) | 30.38 (0.11) | 30.51 (0.22) | 30.30 (0.38) | 0.89 |
| Social-emotional wellbeing (mean, se) | 17.27 (0.06) | 16.96 (0.14) | 16.69 (0.25) | 0.04 |
| Cultural-based resilience (mean, se) | 40.47 (0.10) | 40.53 (0.20) | 39.62 (0.37) | 0.19 |
| Two or fewer stressful life events | 40.2 | 36.1 | 33.7 | 0.04 |
| Mother in paid employment | 64.5 | 66.8 | 70.7 | 0.15 |
Notes: Data in table are from data including multiple imputation. P-values are from logistic or linear regression comparing sample outcomes by full-term and perinatal risk groups (p for the trend across full-term, mild, and moderate-to-high perinatal risk groups). Bold-face represents statistically significant results (p<0.05).
aData for maternal education were collected at time 2.