Table 2. Correlations matrices across waves.
| Variables | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| SRS factors | ||||||||
| 1. SCI | - | |||||||
| 2. RRB | .78*** | - | ||||||
| Concurrent validity (T7) | ||||||||
| 3. VS | -.54*** | -.40*** | - | |||||
| 4. ABCL | .47*** | .58*** | -.11 | - | ||||
| Predictive validity (T8) | ||||||||
| 5. VS | -.58*** | -.43*** | .95*** | -.11 | - | |||
| 6. ABCL | .42*** | .54*** | -.12 | .81*** | -.07 | - | ||
| Convergent validity (ADI-R at T7) | ||||||||
| 7. Social | .61*** | .45*** | -.64*** | .19** | -.64*** | .16* | - | |
| 8. Behavioral | .30*** | .38*** | -.29*** | .21** | -.33*** | .18* | .37*** | - |
| Covariates | ||||||||
| 9. Male | -.06 | -.03 | -.01 | .01 | .08 | -.02 | .01 | .03 |
| 10. With ID | .39*** | .28*** | -.73*** | .05 | -.71*** | .05 | .49*** | .33*** |
| 11. Age at T7 | .05 | -.04 | -.12 | .01 | -.13 | -.00 | .19** | -.03 |
| M | 1.59 | 1.27 | 46.35 | 59.45 | 46.43 | 59.32 | 24.06 | 4.73 |
| SD | .45 | .49 | 22.91 | 7.90 | 22.40 | 8.14 | 9.30 | 2.47 |
| n | 237 | 237 | 211 | 229 | 190 | 207 | 218 | 218 |
Notes. SRS = Social Responsiveness Scale. SCI = Social Communication & Interaction factor. RRB = Restricted/Repetitive Behavior factor. ADI-R = Autism Diagnostic Interview-Revised. T7 = Time 7. ABCL = Adult Behavior Checklist. VS = Vineland Screener. T8 = Time 8. ID = Intellectual disability.
*
p < .05,
**
p < .01,
***
p < .001.