Table 1.
Participant characteristics in the final sample
| Group | |||
|---|---|---|---|
| ASD | ID | TD | |
| N (boys:girls) | 12 (11:1) | 10 (9:1) | 12 (9:3) |
| CA (years:months) | 4:4 (0:11), 2:10–5:10 | 5:1 (1:1), 3:11–7:2 | 4:7 (0:10), 2:9–5:10 |
| Developmental age (years: months) | 2:7 (0:11), 1:2–4:2 | 2:7 (0:6), 1:10–3:4 | |
| SCQ (cut-off 15) | 9.11 (5.11), 4–18 | 3.25 (2.22), 0–7 | |
| ADOS-2 | |||
| SA | 15.6 (3.1), 9–20 | ||
| RRB | 5.3 (1.4), 3–8 | ||
| Comparison score | 8.1 (1.5), 6–10 | ||
| ADI-R | |||
| Social domain (cut-off 10) | 19.8 (6.3), 6–28 | ||
| Communication domain (cut-off 8) | 16 (2.3), 14–20a | ||
| 10.5 (2.7), 7–14b | |||
| Stereotypy domain (cut-off 3) | 7.3 (2.7), 4–12 | ||
All values are given as mean (SD), range
ASD autism spectrum disorder, ID intellectual disability, TD typical development, CA chronological age, SCQ Social Communication Questionnaire, ADOS-2 Autism Diagnostic Observation Schedule 2, SA social affect, RRB restricted repetitive behaviour, ADI-R Autism Diagnostic Interview-Revised
aVerbal children (N = 4)
bNon-verbal children (N = 8)