Estimated mean differences in cognitive test scores and 95% CIs from mixed model analyses in extremely preterm participants and term-born controls
| Extremely preterm children and term-born classroom controls | |||
| Parameter | Unadjusted model (n=495) | Adjusted for sex (n=495) | Adjusted for maternal education (n=456) |
| Estimate (95% CI) | Estimate (95% CI) | Estimate (95% CI) | |
| Fixed | |||
| Constant | 105.2 (103.5 to 106.9) | 105.1 (103.0 to 107.2) | 104.2 (102.2 to 106.3) |
| EP | −25.2 (−27.8 to −22.6) | −21.0 (−24.4 to −17.6) | −25.0 (−27.7 to −22.2) |
| Age | −0.3 (−0.5 to −0.1) | −0.3 (−0.5 to −0.1) | −0.3 (−0.5 to −0.1) |
| EP × age | 0.5 (0.2 to 0.7) | 0.5 (0.2 to 0.7) | 0.5 (0.3 to 0.8) |
| Male | – | 0.1 (−2.8 to 3.0) | – |
| EP × male | – | −8.8 (−13.6 to −4.0) | – |
| Higher maternal education | – | – | 3.2 (0.8 to 5.7) |
| Random | |||
| Within-individual | |||
| EP SD | 8.7 (8.1 to 9.4) | 8.7 (8.1 to 9.4) | 8.8 (8.1 to 9.5) |
| Control SD | 5.7 (4.9 to 6.7) | 5.7 (4.9 to 6.7) | 5.6 (4.8 to 6.6) |
| Between-individual | |||
| EP intercept SD | 16.3 (14.9 to 17.9) | 15.8 (14.3 to 17.3) | 16.2 (14.7 to 17.9) |
| EP slope SD | 0.5 (0.3 to 0.8) | 0.5 (0.3 to 0.8) | 0.5 (0.3 to 0.8) |
| EP corr(intercept, slope) | 0.3 (−0.01 to 0.6) | 0.4 (0.04 to 0.7) | 0.3 (−0.02 to 0.6) |
| Control intercept SD | 10.6 (9.2 to 12.2) | 10.6 (9.2 to 12.2) | 10.6 (9.1 to 12.2) |
| Control slope SD | 0.7 (0.5 to 1.0) | 0.7 (0.5 to 1.0) | 0.7 (0.5 to 1.0) |
| Control corr(intercept, slope) | −0.6 (−0.8 to −0.3) | −0.6 (−0.8 to −0.3) | −0.6 (−0.8 to −0.3) |