Table 1.

Participant descriptive characteristics with Mean, Standard Deviation, and Range

	ASD	Comparison	Signif.(t, p)
Sex; Race	18 male; 18 white	15 male; 18 white
Age in months	82.5 (7.3); 72–94	80.9 (7.6); 73–95	0.69, ns
Family gross annual income	104.6 (34.5); 45–190	120.7 (69.5); 35–300	−.97, ns
Paternal highest education†	6; 4–7	6; 4–7	202.5, ns
Maternal highest education†	6; 4–7	6; 5–7	195.0, ns
DAS-2 GCA	102.3 (12.4); 84–133	108.0 (5.3); 100–118	−1.9, ns
DAS-2 Verbal Composite	104.1 (14.3); 71–125	108.3 (9.2); 94–123	−1.1, ns
Vineland-2 Communication	93.7 (9.2); 78–108	106.3 (5.9); 93–115	−5.3, <.001
Vineland-2 Socialization	81.0 (8.2); 66–96	99.7 (5.0); 91–110	−8.9, <.001
Social Skills Rating System	78.8 (13.6); 56–104	107.6 (10.6); 84–127	−7.5, <.001
ADOS Social Affect	10.6 (3.9); 5–19
Repetitive Beh. Scale-Revised	23.0 (17.7); 1–65	2.9 (3.0); 0–11	5.0, <.001
ADI-R Higher Order Rep. Beh.	4.0 (2.4); 0–8
ADOS Restricted/Rep. Beh.	3.6 (1.8); 0–8

Note: Household income is reported in thousands of US dollars. Parental education is coded as 4= high school, 5=some college, 6=college, 7=graduate school. Standard scores with an average range of 85–115 are reported for the Differential Ability Scales-2 (DAS-2), Vineland-2, and Social Skills Rating System (SSRS). Raw scores are reported for the Repetitive Behavior Scale-Revised (RBS-R), Autism Diagnostic Interview-Revised (ADI-R) and Autism Diagnostic Observation Schedule (ADOS).

^†Median score and Mann-Whitney U is reported for this ordinal variable.