Cognitive outcomes at 9 years of age
| Intervention Mean (SD) (N=66) | Control Mean (SD) (N=59) | Adjusted mean difference (95% CI) | p Value* | |
|---|---|---|---|---|
| Full scale IQ score | 100.9 (14.3) | 98.2 (16.6) | 2.12 (−3.4 to 7.6) | 0.45 |
| Total verbal IQ score | 102.7 (13.7) | 99.69 (16.3) | 2.4 (−2.9 to 7.8) | 0.37 |
| Total performance IQ score | 98.7 (17.7) | 97.2 (15.8) | 1.1 (−4.9 to 7.2) | 0.71 |
| Verbal Comprehension Index | 104.1 (13.8) | 100.1 (15.6) | 3.5 (−1.8 to 8.7) | 0.19 |
| Perceptual Organisational Index | 99.8 (17.1) | 98.4 (15.3) | 0.8 (−5.0 to 6.6) | 0.78 |
| Freedom from distractibility | 97.2 (14.5) | 96.4 (15.1) | 0.5 (−5.0 to 5.9) | 0.86 |
| Processing Speed Index | 94.9 (16.2) | 92.8 (20.0) | 2.2 (−4.3 to 8.7) | 0.51 |
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.