TABLE 2.
Results of Survival Analyses
| Model | Wald χ2 | P | −2LL |
|---|---|---|---|
| Model 0 (null) | 14 673.57 | ||
| Model 1 | 14 592.99 | ||
| Group | 11.25 | .001 | |
| NVIQ | 32.30 | <.001 | |
| Group × NVIQ | 7.63 | .006 | |
| Model 2 | 14 583.71 | ||
| Gender | 8.96 | .003 | |
| Group | 11.68 | .001 | |
| NVIQ | 32.64 | <.001 | |
| Group × NVIQ | 8.37 | .004 | |
| Model 3 | 14 581.68 | ||
| Seizure | 1.96 | .16 | |
| Gender | 8.52 | .004 | |
| Group | 10.73 | .001 | |
| NVIQ | 29.73 | <.001 | |
| Group × NVIQ | 7.52 | .006 |
Parent-reported seizure data were missing for n = 105 (12%) participants with ASD and n = 10 (3%) non-ASD participants. For the purposes of these analyses, missing data were coded as “no seizures” so that the full sample could be retained for Model 3. Sensitivity analyses were performed to ensure that the results were identical when Models 1 to 3 were evaluated in the sample with the full complement of data (n = 1070).