Evidence for contribution of common genetic variants within chromosome 8p21.2-8p21.1 to restricted and repetitive behaviors in autism spectrum disorders

Table 2 Two-Factor solution for the Restricted and Repetitive Behaviors (RRB) in the AGRE cohort using PCA with varimax rotation

ADI-R items from RRB domain	Factor1	Factor2
ADI-R items from RRB domain	Repetitive Sensory Motor (RSM)	Insistence On Sameness (IS)
Unusual sensory interests	0.75	0.08
Repetitive use of objects	0.71	0.07
Hand and finger mannerisms	0.48	0.1
Complex mannerisms or stereotyped body movements	0.46	0.12
Difficulties with change	0.03	0.68
Resistance to change	0.13	0.53
Circumscribed interests	-0.11	0.30
Compulsions/rituals	0.16	0.49
Abnormal/Idiosyncratic response	0.25	0.36
Unusual preoccupations	0.12	0.22
Sensitivity to noise	0.1	0.29

ISSN: 1471-2164