| Extremely preterm children only | ||
| Parameter | Adjusted for neonatal brain injury (n=291) | Adjusted for gestational age (n=292) |
| Estimate (95% CI) | Estimate (95% CI) | |
| Fixed | ||
| Constant | 82.4 (80.2 to 84.5) | 81.8 (79.2 to 84.4) |
| Age | 0.2 (0.06 to 0.3) | 0.2 (0.06 to 0.3) |
| Moderate-severe brain Injury | −10.9 (−15.5 to −6.3) | – |
| Gestational age <25 weeks | – | −4.4 (−8.4 to −0.4) |
| Random | ||
| Within-individual SD | 8.7 (8.1 to 9.4) | 8.7 (8.1 to 9.4) |
| Between-individual | ||
| Intercept SD | 15.6 (14.2 to 17.2) | 16.2 (14.7 to 17.7) |
| Slope SD | 0.5 (0.3 to 0.8) | 0.5 (0.3 to 0.8) |
| corr(intercept, slope) | 0.3 (−0.03 to 0.6) | 0.3 (−0.02 to 0.6) |
corr, correlation; EP, extremely preterm.