Development of the Parent-Rated Anxiety Scale for Youth with Autism Spectrum Disorder.

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TitleDevelopment of the Parent-Rated Anxiety Scale for Youth with Autism Spectrum Disorder.
Publication TypeJournal Article
Year of Publication2019
AuthorsScahill, L, Lecavalier, L, Schultz, RT, Evans, ANichole, Maddox, B, Pritchett, J, Herrington, J, Gillespie, S, Miller, J, R Amoss, T, Aman, MG, Bearss, K, Gadow, K, Edwards, MC
JournalJ Am Acad Child Adolesc Psychiatry
Date Published2019 Feb 20
ISSN1527-5418
Abstract

OBJECTIVE: Anxiety is common in youth with autism spectrum disorder (ASD). There is no accepted outcome measure for anxiety in this population.

METHOD: Following a series of focus groups with parents of youth with ASD, we generated 72 items (scored 0-3). Parents of 990 youth with ASD (age 5-17; 80.8% male youth) completed an online survey. Factor analysis and item response theory (IRT) analyses reduced the content to a single factor with 25 items. Children with a least mild anxiety (N=116; age 5-17; 79.3% male youth) participated in a comprehensive clinical assessment to evaluate validity and reliability of the 25-item Parent-rated Anxiety Scale for ASD (PRAS-ASD).

RESULTS: In the online sample, the mean PRAS-ASD score was 29.04 ± 14.9 (range 0 to 75). Coefficient alpha was 0.93. The IRT results indicated excellent reliability across a wide range of scores with low standard errors. In the clinical sample (N=116), the PRAS-ASD mean was 31.0 +15.6 (range 1-65). Pearson correlations with parent ratings of ASD symptom severity, repetitive behavior and disruptive behavior ranged 0.33 to 0.66 supporting divergent validity of the PRAS-ASD. Pearson correlation with a parent-rated measure of anxiety used in the general pediatric population of 0.83 supported convergent validity. Forty participants (32 boys, 8 girls; mean age of 11.9 + 3.4) returned at Time 2 (mean =12.2 days) and Time 3 (mean = 24.2 days). Intraclass correlation showed test-retest reliabilities of 0.88 and 0.86 at Time 2 and Time 3, respectively.

CONCLUSION: The 25-item PRAS-ASD is a reliable and valid scale for measuring anxiety in youth with ASD.

DOI10.1016/j.jaac.2018.10.016
Alternate JournalJ Am Acad Child Adolesc Psychiatry
PubMed ID30797036