title: Brief report: cross-cultural evidence for the heterogeneity of the restricted, repetitive behaviours and interests domain of autism: a Greek study.
abstract: Recent studies provide evidence that the Restricted, Repetitive Behaviours, and Interests (RRBI) domain of autism is heterogeneous, consisting of at least two factors: Insistence on Sameness (IS) and Repetitive Sensory and Motor Behaviours and Interests (RSMB) [Cuccaro et al. (Child Psychiatry and Human Development, 34, 3-7, 2003; Szatmari et al. (Journal of Child Psychology and Psychiatry, 47, 582-590, 2006)]. The main objective of this study was to replicate this two-factor structure in an independent sample of 153 Greek individuals with a diagnosis of Pervasive Developmental Disorder (PDD). Principal Component Analysis was used to analyze the data. Our findings confirmed the two-factor structure (accounting for 52% of the variance), providing evidence for the cross-cultural heterogeneity of the RRBI domain of autism and the clear distinction between IS and RSMB symptoms in individuals with PDD.
authors.affiliation: Department of Psychiatry, University of Ioannina School of Medicine, Dourouti, Ioannina 45 100, Greece. vpapag@cc.uoi.gr
authors.forename: Vaya
authors.initials: V
authors.lastname: Papageorgiou
authors.forename: Stelios
authors.initials: S
authors.lastname: Georgiades
authors.forename: Venos
authors.initials: V
authors.lastname: Mavreas
mesh_terms: D001321:Autistic Disorder / Q000175:diagnosis / Q000208:ethnology*; D002648:Child; D003147:Communication Disorders / Q000175:diagnosis / Q000453:epidemiology; D003431:Cross-Cultural Comparison; D005260:Female; D018740:Genetic Heterogeneity; D006115:Greece; D006801:Humans; D007398:Interpersonal Relations; D007406:Interview, Psychological; D008297:Male; D010641:Phenotype; D013239:Stereotyped Behavior