. Author manuscript; available in PMC: 2011 Mar 15.

Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2008 Jun;47(6):642–651. doi: 10.1097/CHI.0b013e31816bffb7

TABLE 2.

Revised Algorithm Factor Loadings in Collaborative Programs for Excellence in Autism/Studies to Advance Autism Research and Treatment Dataset

Domains	Module 1, No Words, N = 352 (1:25.1)^a	Factor Loadings	Module 1, Some Words, N = 268 (1:19.1)^a	Factor Loadings	Module 2, Younger, N = 88 (1:6.3)^a	Factor Loadings	Module 3, N = 457 (1:32.6)^a	Factor Loadings
Social Affect	Unusual eye contact	0.76	Unusual eye contact	0.83	Unusual eye contact	0.73	Unusual eye contact	0.56
	Gaze and other behaviors	0.82	Gaze and other behaviors	0.81	Amount of social communication	0.73	Amount of social communication	0.78
	Facial expressions	0.83	Facial expressions	0.84	Facial expressions	0.82	Facial expressions	0.64
	Frequency of vocalization	0.82	Frequency of vocalization	0.87	Quality of rapport	0.78	Quality of rapport	0.77
	Shared enjoyment	0.76	Shared enjoyment	0.68	Shared enjoyment	0.81	Shared enjoyment	0.84
	Quality of social overtures	0.94	Quality of social overtures	0.83	Quality of social overtures	0.73	Quality of social overtures	0.72
	Response to joint attention	0.47	Pointing	0.62	Pointing	−0.06 (1.0)	Conversation	0.63
	Gestures	0.78	Gestures	0.69	Gestures	0.48	Gestures	0.66
	Showing	0.72	Showing	0.77	Showing	0.56	Quality of social response	0.72
	Initiation of joint attention	0.72	Initiation of joint attention	0.64	Initiation of joint attention	0.25 (0.58)	Reporting of events	0.37
Restricted, repetitive behaviors	Intonation	0.20 (0.54)	Stereotyped language	0.32 (0.47)	Stereotyped language	−0.02 (0.57)	Stereotyped language	0.66
	Unusual sensory interest	0.67	Unusual sensory interest	0.71	Unusual sensory interest	−0.10 (0.72)	Unusual sensory interest	0.43
	Repetitive interests	0.67	Repetitive interests	0.55	Repetitive interests	−0.01 (0.63)	Highly specific topics	0.54
	Hand mannerisms	0.68	Hand mannerisms	0.51	Hand mannerisms	−0.16 (0.53)	Hand mannerisms	0.57
Eigenvalues	7.4	1.7	7.5	1.4	7.1	1.3	6.8	1.4
RMSEA	0.05		0.06		0.08		0.06

Note: Item names have been abbreviated from the Western Psychological Services Autism Diagnostic Observation Schedule item names. Refer to the key from Figure 6 in the Autism Diagnostic Observation Schedule Manual⁵ for complete names. RMSEA = root mean square error approximation. Factor loadings are listed by the Social Affect/Restricted, Repetitive Behavior domain assignation from Gotham et al.¹ Where the current loading of an item is <0.40 for the assigned factor, the alternate loading is given in parentheses.

N = n(Items:Subjects).