Cognitive outcomes at 7 years of age
| Intervention Mean (SD) (N=68) | Control Mean (SD) (N=62) | Adjusted mean difference (95% CI)* | p Value* | |
|---|---|---|---|---|
| Full scale IQ score | 96.3 (14.6) | 91.5 (17.8) | 4.1 (−1.5 to 9.8) | 0.15 |
| Total verbal IQ score | 98.6 (15.8) | 92.8 (18.8) | 5.0 (−1.0 to 11.1) | 0.10 |
| Total performance IQ score | 94.2 (15.8) | 91.8 (15.9) | 1.8 (−3.8 to 7.4) | 0.52 |
| Verbal Comprehension Index | 100.1 (15.8) | 92.6 (20.1) | 6.8 (0.5 to 13.0) | 0.035 |
| Perceptual Organisational Index | 94.6 (14.9) | 92.8 (15.4) | 1.0 (−4.3 to 6.3) | 0.71 |
| Freedom from distractibility | 94.8 (16.5) | 91.9 (20.4) | 2.0 (−4.4 to 8.4) | 0.54 |
| Processing Speed Index | 97.2 (14.5) | 93.5 (17.2) | 3.8 (−1.8 to 9.4) | 0.18 |
The means presented are estimated marginal means from a linear mixed model that adjusts for mother education and the clustering effect of twins.
*Adjusted for clustering effects of twin pairs and maternal education.