. Author manuscript; available in PMC: 2011 Oct 1.

Published in final edited form as: J Autism Dev Disord. 2010 Oct;40(10):1259–1273. doi: 10.1007/s10803-010-0983-1

Table 1.

Summary characteristics of each diagnostic group

	Autism group (n = 179)	PDD-NOS group (n = 78)	DD group (n = 69)
Mean age (mo)	30.9 (SD = 3.4)	30.7 (SD = 3.8)	30.4 (SD = 3.9)
Nonverbal mental age (mo)	20.7 (SD = 5.7)	23.5 (SD = 6.8)	22.3 (SD = 7.4)
Sex (M = male; F = female)	145 M/33 F	68 M/10 F	41 M/28 F
	1 Missing
Ethnicity	131 White	59 White	52 White
	37 African American	17 African American	15 African American
	6 Asian	1 Asian	1 Biracial
	2 Biracial	1 Missing	1 Missing
	3 Missing

Nonverbal mental age was based on composite nonverbal age equivalent scores on the Mullen Scales PDD-NOS pervasive developmental disorder-not otherwise specified, DD developmental delay