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Gilliam Asperger’s Disorder Scale (GADS)

The Gilliam Asperger’s Disorder Scale (GADS; Gilliam, 2001) is a 32-item questionnaire designed to identify individuals with Asperger’s Disorder.

Overview

The tool includes several subscales: Social Interaction, Restricted Patterns, Cognitive Patterns, and Pragmatic Skills. The GADS can be completed by parents/caregivers or teachers. Respondents indicate the frequency of behaviors from “never observed” to “frequently observed.” The GADS includes a parent interview form that inquires about language and cognitive development, self-help skills, adaptive behavior, and curiosity. There is also a section of “key questions” for parents/caregivers to complete.

Summary

Author (yr) Age Range (yrs) Method of Administration/Format Approx. Time to Administer Subscales
Gilliam Asperger’s Disorder Scale (GADS) Gilliam (2001) 3-22

32-item parent/caregiver or teacher questionnaire

Includes a parent interview form to gather information about language and cognitive development, self-help skills, adaptive behavior, and curiosity

Yields standard scores and percentiles

5-10 min.

Social Interaction; Restricted Patterns; Cognitive Patterns; Pragmatic Skills

Screening/Diagnosis: S

Availability: Pro-Ed, https://www.proedinc.com/Products/9460/gads-gillia...

Research

Author (yr) Sample Size Topic(s) Addressed Outcome
Mayes, et al. (2009) 520 - Age Range: Mayes, et al. (2009) 5.5–7.6 (mean age) Criterion-related validity Inter-rater reliability

Criterion-related validity: Accuracy rates based on clinician scores were: 88% of low functioning scored in the Asperger’s Disorder range; 92% of high-functioning accurately identified; 4% of children with ADHD were misclassified with autism.

Accuracy rates based on parent scores were: 72% low functioning scored in the Asperger’s Disorder range; 74% high-functioning; 19% of children with ADHD were misclassified.

Inter-rater reliability: parents and clinician ratings did not differ significantly (r = 0.53, p <0.0001).

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