Table 5.
Results of GEE univariate analysis with parameter estimates, standard errors and Wald Chi square for the cohort for the dependent variable cognitive level.
| Wald | ||||
|---|---|---|---|---|
| Variable | B | SE | Chi-square | P-value |
| Sex = Female | 2.25 | 0.79 | 8.14 | 0.004 |
| Time | 16.2 | <0.001 | ||
| Time = 18 months | -0.41 | 0.31 | 1.78 | 0.18 |
| Time = 5 years | 1.58 | 0.48 | 10.8 | 0.001 |
| SGA = 0 | 1.1 | 0.72 | 2.34 | 0.12 |
| BPD = 0 | -0.12 | 0.67 | 0.03 | 0.86 |
| IVH | 8.6 | 0.01 | ||
| IVH = 0 | 2.4 | 0.93 | 6.45 | 0.01 |
| IVH = 1 | 2.9 | 1.00 | 8.43 | 0.004 |
| Maternal education∗ | ||||
| University | 5.5 | 0.86 | 40.6 | <0.001 |
| Bachelor/masters | 3.4 | 0.83 | 16.5 | <0.001 |
| Diploma | 1.7 | 0.42 | 16.3 | <0.001 |
| Elementary | 1.9 | 0.72 | 7.2 | 0.007 |
| Paternal education∗ | ||||
| University | 5.3 | 0.91 | 34.1 | <0.001 |
| Bachelor/masters | 2.9 | 0.92 | 10.1 | 0.001 |
| Diploma | 3.8 | 0.59 | 41.6 | <0.001 |
| High School | 2.2 | 0.42 | 27.4 | <0.001 |
| Elementary | 1.9 | 0.67 | 7.8 | 0.005 |
| Respiratory#support level | ||||
| Level = 0 | 1.7 | 0.70 | 5.5 | 0.019 |
| Level = 1 | 1.6 | 0.65 | 5.8 | 0.015 |
∗Reference: less than elementary. #Reference: respiratory support = level 2 (invasive ventilatory support >6 days).