Structure of Restricted Repetitive Behaviors of Individuals Referred for Autism Spectrum Disorder Assessment.

Researchers studied repetitive behaviors in children referred for autism assessment. They found that children with autism show two main types of repetitive behaviors: body movements (like hand flapping) and needing things to stay the same. Children with other conditions showed different patterns of repetitive behaviors. This difference might help doctors better identify which children are more likely to have autism during assessments.

This study examined restricted repetitive behaviors (RRBs) in 558 individuals referred for autism assessment, comparing those diagnosed with ASD (n=292) versus other neurodevelopmental disorders (n=266). Using exploratory factor analysis of ADI-R items, researchers found that RRBs in the ASD group clustered into two factors consistent with previous literature: 'Repetitive Sensorimotor' behaviors and 'Insistence on Sameness' behaviors. However, the non-ASD group showed a different pattern, with RRBs clustering into 'Higher Order' and 'Lower Order' behaviors. These distinct patterns suggest RRBs could potentially be used as screening tools to better identify children at higher risk for ASD during clinical evaluations.

RRB pattern analysis using ADI-R may enhance diagnostic differentiation between ASD and other neurodevelopmental disorders. The distinct clustering patterns could inform clinical decision-making and improve screening accuracy for children referred for autism assessment, though further validation is needed.

The study appears to be cross-sectional and exploratory in nature. Specific demographic details, assessment protocols, and validation of findings are not detailed in the abstract. The clinical utility of RRB patterns as screening tools requires further validation studies.

Restricted and/or repetitive displays of behavior, interests, or activities (RRBs) are one of the core symptom domains of autism spectrum disorder (ASD). Current and past research indicates two 'clusters' of RRBs in children with ASD: repetitive sensorimotor (e.g., hand/finger and more complex motor mannerisms) and insistence on sameness (e.g., resistance to changes in the environment) behaviors. The current study aims to fill a gap by examining how RRBs may diverge in individuals with ASD and with other neurodevelopmental disorders (ONDD) in a clinical sample. A total of 558 individuals were seen at a tertiary care clinic for a comprehensive clinical assessment of ASD.

The sample was split into ASD (n = 292 individuals) and ONDD (n = 266) groups based on clinical diagnosis. Exploratory factor analyses were conducted using Autism Diagnostic Interview-Revised (ADI-R) RRB item scores for the overall sample, the ASD group, and the ONDD group. Exploratory factor analysis of ADI-R RRB items indicated a 2-factor solution for the full sample and ASD group. Items loaded onto two factors comprised of "Repetitive Sensorimotor" and "Insistence on Sameness" behaviors, consistent with previous literature.

Results demonstrated a unique loading pattern for the non-ASD group, with items clustering into "Higher Order" (e.g., circumscribed interests) and "Lower Order" (e.g., hand and finger mannerisms) behaviors. The results of the current study may point towards using RRBs to guide screening of children who are referred for an ASD evaluation to better identify children who are at higher risk of having ASD.