Table 3.

Group means and differences.

	Daily living skills deficit (n = 235)	No daily living skills deficit (n = 182)
Age (months)*	160.3 (27.7)	151.9 (24.3)
Sex (male:female ratio)	9.7:1	9.1:1
ADI-R RSM	2.7 (2.2)	2.3 (1.9)
ADI-R IS	4.1 (2.5)	4.0 (2.4)
ADI-R Social–Communication*	13.1 (4.8)	11.2 (4.7)
ADOS CSS	6.9 (1.7)	6.9 (1.7)
Full-scale IQ	106.5 (14.1)	104.8 (16.6)
CBCL Internalizing	63.8 (9.5)	62.8 (8.9)
CBCL Externalizing	55.1 (11.1)	54.6 (11.3)

ADI-R: Autism Diagnostic Interview-Revised; RSM: Repetitive Sensory Motor; IS: Insistence on Sameness; ADOS: Autism Diagnostic Observation Schedule; CSS: Calibrated Severity Score; CBCL: Child Behavior Checklist; IQ: intelligence quotient.

^*p < 0.001.