Table 2.
Estimates for Predictors of Leiter-R Brief IQ Standard and Growth Scores (n = 41)
| IQ | Growth Scores | |||||
|---|---|---|---|---|---|---|
|
|
||||||
| Fixed Effect | Coefficient | (SE) | p | Coefficient | (SE) | p |
| Intercept | ||||||
| Intercept (mean) | 44.70 | 3.00 | < .001* | 467.26 | 2.32 | < .001* |
| Autism Severity | −1.22 | .81 | .139 | −1.02 | .62 | .107 |
| FMRP | 41.44 | 11.53 | .001* | 35.36 | 8.88 | .001* |
| Environment | −.91 | 2.58 | .725 | −.50 | 1.98 | .801 |
| Slope | ||||||
| Age (rate of change) | −1.38 | .50 | .010* | .73 | .46 | .119 |
| Autism Severity | −.10 | .13 | .423 | −.10 | .11 | .406 |
| FMRP | 2.60 | 1.98 | .197 | 2.34 | 1.81 | .206 |
| Environment | −.20 | .41 | .637 | .16 | .37 | .671 |
| Slope | ||||||
| Age Squared | .17 | .10 | .107 | −.11 | .10 | .288 |
Note. Intercept reflects a chronological age of 14 years. Models estimated with log-transformed FMRP yielded similar results, with the exception of the fact that the positive effect of age for growth scores was also significant, t(37) = 3.50, p = .002.