Psychometric evaluation of the Autism Symptom Dimensions Questionnaire.
Thomas W Frazier, Anastasia Dimitropoulos, Leonard Abbeduto and 6 others
PMID 39699005WHAT IT FOUND
The Autism Symptom Dimensions Questionnaire reliably tracks social and repetitive behaviors across ages and backgrounds.
It screens well in general populations but poorly distinguishes autism from other disabilities in clinical settings. Use it to map symptom profiles, not to diagnose.
Key findings
01The questionnaire showed excellent internal consistency and measurement invariance across age, sex, race, ethnicity, and diagnosis.
02Screening accuracy was very good in the population sample but only fair in the clinical sample.
03Reliable improvement required a score reduction greater than 9.2 on the total scale or 11.6 on the social communication domain.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The clinical sample had a predominance of males and over-representation of Black and Hispanic participants, which may limit generalizability to other demographic groups. Sensitivity to change was only examined in a small, selected case series of seven children receiving intensive behavioral intervention, not in a controlled trial. The study used online diagnostic evaluations without direct collection of cognitive or developmental information, which may affect the accuracy of the reference standard diagnoses. Diagnostic efficiency was poor in the clinical sample, meaning the tool cannot reliably distinguish autism from other developmental disabilities in already-referred populations.
Declared interests
Several authors have received funding, consulted, or hold equity in organizations related to autism research, diagnostics, and pharmaceuticals, including Autism Speaks, Quadrant Biosciences, MaraBio, and various pharmaceutical companies. Dr. Youngstrom has received royalties from psychological assessment publishers.
The easy way to misread this
Do not use the ASDQ to diagnose autism in children already referred to clinical services. Its diagnostic efficiency in this group was only fair (AUC = 0.608), meaning it cannot reliably distinguish autism from other developmental disabilities. Use it for screening in general populations or for describing symptom profiles, not for making diagnostic decisions.