Table III.
Parameter estimates for best-fit general linear models of Mental Stories, Physical Stories, structural language, pragmatic language and behaviour, with group, IQ, and age (for non-standardized measures) as predictors
| Measure | Parameter | Estimate (β) | SE | 95% CI | p | R2 |
|---|---|---|---|---|---|---|
| Mental Storiesa | Age | 0.04 | 0.009 | 0.02–0.06 | <0.001 | 0.46 |
| IQ | 0.08 | 0.02 | 0.04–0.11 | <0.001 | ||
| Generalized epilepsy | –1.6 | 0.64 | –2.8 to –0.3 | 0.002 | ||
| Focal epilepsy | –2.3 | 0.63 | –3.5 to –1.0 | <0.001 | ||
| Physical Stories | Age | 0.07 | 0.01 | 0.05–0.09 | <0.001 | 0.43 |
| IQ | 0.09 | 0.02 | 0.05–0.12 | <0.001 | ||
| Structural language | IQ | 0.2 | 0.08 | 0.06–0.36 | 0.006 | 0.40 |
| Generalized epilepsy | –6.5 | 2.9 | –12.1 to –0.83 | 0.03 | ||
| Focal epilepsy | –13.8 | 2.8 | –19.4 to –8.3 | <0.001 | ||
| Pragmatic language | Generalized epilepsy | –9.5 | 3.4 | –16.0 to –2.9 | 0.005 | 0.24 |
| Focal epilepsy | –15.5 | 3.1 | –21.5 to –9.4 | <0.001 | ||
| Total Problems | Generalized epilepsy | 10.5 | 3.3 | 3.9–17.0 | 0.002 | 0.17 |
| Focal epilepsy | 11.0 | 3.1 | 5.0–17.0 | <0.001 |
The control group is used as the reference category in all analyses. For all models reported, the residuals did not depart from normality, and there were no dependencies between residuals and factors.
a
A model which included group as a main effect, and an age and IQ interaction term only, was also a good fit, but given the focus on whether a group effect remains after controlling for age and IQ, the more interpretable main-effects model is reported. SE, standard error; CI, confidence interval.