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

Published in final edited form as: Dev Psychopathol. 2010 Winter;22(1):55–69. doi: 10.1017/S0954579409990265

Table 3.

Factor Loadings of ADI-R RRB Items by Age

	RRB item	Age 2	Age 3	Age 5	Age 9
RSM factor	Repetitive use of objects	.81	.74	.72	.73
	Unusual sensory interests	.67	.81	.75	.70
	Hand/finger mannerisms	.55	.60	.87	.73
	Other complex mannerisms	.49	.70	.75	.72

IS factor	Resistance to trivial changes in environment	.91	.77	1.00	.78
	Difficulties with changes in routine	.80	.56	.67	.75
	Compulsions and rituals	.62	.30	.62	.47