Table 6.
Model 2: Fixed Effects Estimates
| Estimate | SE | t | p‐Value | |
|---|---|---|---|---|
| Intercept | 25.76 | 3.85 | 6.68 | < .01 |
| Male ASD (simplex) | 69.84 | 6.16 | 11.33 | < .01 |
| Male ASD (multiplex) | 62.94 | 7.08 | 8.88 | < .01 |
| Female ASD | 47.51 | 1.78 | 4.03 | < .01 |
| Male psych | 31.94 | 6.25 | 1.97 | .05 |
| Age | −0.13 | 0.64 | −0.20 | .84 |
| Age × Age | −0.02 | 0.04 | −0.62 | .53 |
| Age × Male ASD (Simplex) | 1.06 | 0.99 | 1.07 | .29 |
| Age × Male ASD (Multiplex) | 1.81 | 1.23 | 1.46 | .14 |
| Age × Female ASD | 5.95 | 1.82 | 3.28 | < .01 |
| Age × Male Psych | 0.27 | 2.17 | 0.12 | .90 |
| Age × Age × Male ASD (Simplex) | −0.04 | 0.04 | −0.94 | .34 |
| Age × Age × Male ASD (Multiplex) | −0.12 | 0.06 | −2.09 | .04 |
| Age × Age × Female ASD | −0.27 | 0.07 | −4.08 | < .01 |
| Age × Age × Male Psych | −0.04 | 0.07 | −0.61 | .54 |
Model 2: random intercept, fixed slope. This model, which fit the data best, assumes a spatial exponential residual correlation structure and includes group, age, age squared, and interaction between group and age and age squared. ASD = autism spectrum disorder.