TABLE 4.
The Moderation Model: Testing Moderation of Initial Autism Severity on Effects of Treatment Intensity on Trajectory of Change in Autism Severity Over 24 Months
| Dependent variable: autism severity | |||||
|---|---|---|---|---|---|
| Type III tests of fixed effects | |||||
| Effect | DFb | DFw | F | p | f^2 |
| Intercept | 1 | 146 | 0.0 | .84 | 0.00 |
| Slope | 1 | 221 | 6.1 | .02 | 0.03 |
| Spline | 1 | 221 | 0.5 | .50 | 0.00 |
| Intensity | 1 | 146 | 0.0 | .98 | 0.00 |
| Intensity * slope | 1 | 221 | 4.1 | .04 | 0.02 |
| Intensity * spline | 1 | 221 | 2.0 | .16 | 0.01 |
| Site | 2 | 151 | 0.2 | .84 | 0.00 |
| Site * slope | 2 | 226 | 2.3 | .10 | 0.02 |
| Site * spline | 2 | 224 | 1.9 | .16 | 0.02 |
| Intensity * site | 2 | 151 | 0.1 | .91 | 0.00 |
| Intensity * site * slope | 2 | 226 | 3.6 | .03 | 0.03 |
| Intensity * site * spline | 2 | 224 | 2.0 | .14 | 0.02 |
| Autism severity | 1 | 146 | 97.3 | <.01 | 0.67 |
| Slope * autism severity | 1 | 221 | 19.6 | <.01 | 0.09 |
| Spline * autism severity | 1 | 221 | 15.3 | <.01 | 0.07 |
| Intensity * autism severity | 1 | 146 | 0.0 | .94 | 0.00 |
| Intensity * slope * autism severity | 1 | 221 | 4.5 | .04 | 0.02 |
| Intensity * spline * autism severity | 1 | 221 | 3.1 | .08 | 0.01 |
Note: Highlighted rows indicate significant interaction effects.