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    Assessing subtypes of restricted and repetitive behaviour using the Adult Repetitive Behaviour Questionnaire-2 in autistic adults.

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    Author
    Barrett, SL; Uljarević, M; Jones, CRG; Leekam, SR
    Date
    2018
    Source Title
    Molecular Autism
    Publisher
    Springer Science and Business Media LLC
    University of Melbourne Author/s
    Uljarevic, Mirko
    Affiliation
    Melbourne School of Psychological Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Barrett, S. L., Uljarević, M., Jones, C. R. G. & Leekam, S. R. (2018). Assessing subtypes of restricted and repetitive behaviour using the Adult Repetitive Behaviour Questionnaire-2 in autistic adults.. Mol Autism, 9 (1), pp.58-. https://doi.org/10.1186/s13229-018-0242-4.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/253662
    DOI
    10.1186/s13229-018-0242-4
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6258483
    Abstract
    Background: The majority of previous research into restricted and repetitive behaviours (RRBs) has focussed on children, partly due to a lack of suitable measures for RRBs in adults. This study aimed to explore the psychometric properties of the Adult Repetitive Behaviour Questionnaire-2 (RBQ-2A) in a large sample of autistic adults using a self-report questionnaire method. Methods: The RBQ-2A and Autism-Spectrum Quotient (AQ) were administered online. Data from 275 autistic adults aged 18-66 (M = 36.56, SD = 12.24; 100 men and 171 women) were analysed using polychoric principal components analysis (PCA). Reliability and validity were assessed using Cronbach's alpha and correlation analyses. Results: PCA resulted in two components of the RBQ-2A, interpretable as repetitive sensory and motor behaviours (RSMB) and insistence on sameness (IS). Both components showed acceptable internal consistency (α = .70 and .81 respectively) and were significantly moderately correlated with scores on the AQ (r s  = .25 and .42). Participants' scores on IS were higher than their scores on RSMB. RSMB, but not IS, was negatively associated with age, particularly in older adults (≥ 50 years). There were no gender differences. Conclusions: The RBQ-2A is a reliable and valid self-report measure of RRBs in the present sample of autistic adults. As one of the few measures of RRBs aimed at adults, it is suitable for adults with the ability to read and complete a self-report questionnaire. Results build on previous work with children using the Repetitive Behaviour Questionnaire-2 (RBQ-2).

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