Table 1. Descriptive statistics for age, cognitive ability and autism symptomatology measures.
| Measure | Group | |||||
| ASD (n = 15) | Typical (n = 15) | |||||
| M (SD) | Range | M (SD) | Range | Cohen’s d | ||
| Age (months) | 110.9 (21.6) | 81–152 | 106.0 (20.9) | 75–138 | t(28) = −.63, p = .54 | 0.24 |
| Nonverbal IQa | 107.8 (17.6) | 84–134 | 105.3 (13.4) | 81–129 | t(28) = −.43, p = .67 | 0.16 |
| Verbal IQa | 96.5 (11.1) | 81–118 | 102.1 (7.3) | 87–114 | t(24.22) = 1.64, p = .12e | 0.67 |
| Full Scale IQa | 101.6 (12.7) | 87–125 | 104.0 (6.5) | 88–112 | t(20.89) = .65, p = .52e | 0.28 |
| SCQb | 25.5 (6.8) | 12–34 | 1.7 (2.4) | 0–8 | t(17.41) = −12.84, p<.001e | 6.16 |
| ADOS-2b , c | 7.9 (5.3) | 0–21 | ||||
| CFMT-Cd | 69.3 (9.1) | 52–82 | 77.1 (12.1) | 57–97 | t(28) = 1.99, p = .03f | 0.75 |
a
Nonverbal and verbal IQ were measured with the WASI [65]: Matrix Reasoning and Block Design (nonverbal IQ) and Similarities and Vocabulary (verbal IQ). Full-scale IQ (FSIQ) was derived by standardizing the sum of both verbal and performance ability scores against age-based norms.
b
Higher scores on both the SCQ [38] and ADOS-2 [40] indicate a greater degree of autism symptomatology.
c
ADOS-2 score reported = Communication+Social Interaction algorithm total (cut-off = 7).
d
Accuracy (total percentage correct) on the Cambridge Face Memory Test - for Children [41].
e
Equal variances not assumed.
f
One-tailed independent samples t-test.