Theory of Mind Indexes the Broader Autism Phenotype in Siblings of Children with Autism at School Age

Table 1

Participant characteristics by group.

	HR-ASD ()	HR-Other ()	HR-Typical ()	LR-Typical ()
Male, %	63.64	50.00	37.50	59.09	0.39
Caucasian, %	36	31	58	84	0.001
High SES^2, %	60	50	24	52	0.25
Age at testing in years, M (SD)	5.46 (0.46)	6.04 (1.29)	5.52 (0.45)	5.89 (0.41)	0.01

Note. Some families did not provide complete demographic data. Percentages are relative to all responses received.
¹ value = significance level for Kruskal-Wallis test of overall group differences.
²High SES = annual family income ≥ USD $125,000.