Table 4.
Growth Models for Changes in RSM Scores from Age 2 to Age 9
| Predictors | Model 1 Coefficient (SE) | Model 2 Coefficient (SE) | Model 3 Coefficient (SE) |
|---|---|---|---|
| Fixed Effects | |||
| Intercept | 3.86*** (0.18) | 5.58*** (0.35) | 5.63*** (0.38) |
| Age at Testing | −0.02* (0.01) | −0.05* (0.01) | −0.03 (0.01) |
| Age-squared | 0.0002* (.0001) | 0.0003* (0.0001) | 0.0002 (0.0001) |
| Age 2 Diagnosis | |||
| Autism | -- | -- | |
| PDD-NOS | −1.47*** (0.37) | −1.26** (0.41) | |
| Nonspectrum | −3.02*** (0.41) | −2.62*** (0.58) | |
| Gender | |||
| Female | −0.10 (0.36) | −0.37 (0.34) | |
| Site | |||
| North Carolina | −0.62 (0.32) | −0.83** (0.31) | |
| Race | |||
| Non-White | 0.11 (0.32) | −0.17 (0.30) | |
| Maternal Education | |||
| High school diploma | −0.37 (0.31) | −0.24 (0.29) | |
| NVIQ at 2 | −0.02 ** (0.01) | ||
| ADOS Social Affect at 2 Score | −0.002 (0.002) | ||
| Interactions Terms | |||
| Age* NVIQ | −0.001**(0.0004) | ||
| Age-squared* NVIQ | 9.43 ×10−6 (3.88 × 10−6) | ||
| Random Effects | |||
| Intercept variance | 4.64 *** (0.60) | 2.93*** (1.37) | 2.47***(0.39) |
| Slope variance | 0.0004*** (0.0001) | 0.0004***(0.0001) | 0.0004***(0.0001) |
| Intercept/slope covariance | −0.01 (0.007) | −0.003 (0.006) | 0.006 *(0.005) |
***
p < .001
**
p < .01
*
p < .05
Note Significant effects are in bold. Due to space constraints, only significant interaction effects are shown.