Table 3. Correlation between cognitive development and socioeconomic and perinatal characteristics by group.
| Full-term | Preterm | |||
|---|---|---|---|---|
| 6 months | 12 months | 6 months | 12 months | |
| Birth weight (g) | 0.18 | 0.46* | -0.11 | 0.03 |
| Socioeconomic level (CCEB)† | -0.23 | 0.08 | 0.01 | -0.19 |
| Maternal age | 0.13 | -0.43 | 0.13 | 0.07 |
| Paid maternal employment | 0.24 | 0.43 | 0.01 | -0.01 |
| Cesarean section | -0.04 | -0.23 | -0.02 | -0.29 |
| Apgar at 5 minutes | 0.31 | 0.17 | -0.15 | -0.15 |
| Gestational age (weeks) | 0.19 | 0.14 | -0.19 | -0.20 |
| Head circumference at birth (cm) | 0.54* | 0.26 | -0.29 | 0.11 |
| Corticosteroids antenatal | - | - | -0.15 | -0.02 |
| Days in the neonatal unit | - | - | -0.11 | -0.19 |
| Male sex | -0.08 | -0.19 | -0.21 | 0.06 |
| Small for gestational age | - | - | -0.06 | 0.26 |
| Sepsis | - | - | -0.12 | -0.08 |
| Retinopathy of prematurity | - | - | -0.05 | 0.20 |
| Intraventricular hemorrhage grade I or II | - | - | 0.06 | 0.29 |
| Hyaline membrane disease | - | - | 0.12 | -0.16 |
| Bronchopulmonary dysplasia | - | - | 0.06 | -0.23 |
| Invasive mechanical ventilation time | - | - | -0.21 | -0.18 |
| Necrotizing enterocolitis | - | - | -0.41 | -0.50* |
*
Significant according to Spearman's correlation;
†
CCEB (Criterion of Economic Classification Brazil).