Table 1.

Sample characteristics

	ASD (n = 15)	HR-noASD (n = 49)	LR(n = 81)
Gender, % male	87 %	57 %	57 %
Ethnicity, Caucasian	80 %	84 %	88 %
Parent education
High school/some college	50 %	36 %	14 %
College degree	29 %	34 %	42 %
Graduate degree	21 %	30 %	44 %
Age at 22 month assessment, M (SD)	22.78 (.70)	22.72 (.73)	22.76 (.68)
Mullen early learning composite, M (SD)	77.71 (17.14)	98.96 (13.04)	106.16 (15.63)
ADOS severity score, M (SD)	5.07 (1.39)	1.60 (.92)	1.41 (.91)

Seven children are missing Mullen scores (one ASD, four HR-noASD, two LR); one ASD child is missing an ADOS severity score. See text for explanations

ASD toddlers with a later ASD diagnosis, HR-noASD high risk toddlers without a later ASD diagnosis, LR low risk toddlers