Adults with autism spectrum disorder (ASD) are at elevated risk for social anxiety disorder (SAD). Limited information exists on the appropriateness of using social anxiety instruments with these adults. This study examines psychometric properties of self-report social anxiety instruments in autistic adults without intellectual disability, compared to adults with SAD. Additionally, we compared instrument scores between autistic adults with a dual diagnosis of SAD and adults with SAD only. Adults diagnosed with SAD (N=316) or ASD (N=102) were recruited from the Brain and Mind Centre in New South Wales, Australia. Sixty autistic participants received a diagnosis of SAD. Participants completed the Liebowitz Social Anxiety Scale-self-report, the Social Interaction Anxiety Scale, the Social Phobia Scale, and the Brief Fear of Negative Evaluation Scale. All instruments showed excellent internal consistency in autistic adults. Summary scores across instruments were strongly correlated within both groups, and the strength of these correlations were equivalent between ASD and SAD. For all instruments, the performance of autistic adults with a dual diagnosis of SAD was comparable to adults diagnosed with SAD only. Findings suggest that these instruments display adequate psychometric properties in autistic adults without intellectual disability, supporting the use of these instruments in clinical services.
Psychometric Properties of the Persian Version of the Social Anxiety - Acceptance and Action Questionnaire