Table 1.

Participant demographics.

Characteristics, M (SD)	Diagnostic group
	ASD	DD	TD
N	130	61	56
Age in months, M (SD)	20.75 (2.02)	20.82 (1.78)	20.82 (1.47)
Gender, n (%)
Male	110 (84.6)	41 (67.2)	31 (55.4)
Female	20 (15.4)	20 (32.8)	25 (44.6)
Race, n (%)
White	91 (70.0)	37 (60.7)	40 (71.4)
Black	22 (16.9)	17 (27.9)	7 (12.5)
Asian	3 (2.3)	0 (0.0)	1 (1.8)
Biracial	14 (10.8)	7 (11.5)	8 (14.3)
Ethnicity, n (%)
Hispanic	21 (16.2)	6 (9.8)	0 (0.0)
Maternal education in years, M (SD)	14.87 (2.48)	14.26 (2.36)	16.33 (2.76)

SD: standard deviation; ASD: autism spectrum disorder; DD: developmentally delayed; TD: typically developing.