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GARS-3 Test Review
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GARS-3 Test Review
By Juan Carlos Funes
General Descriptive Information
General Descriptive Information
- The Gilliam Autism Rating Scale
- Developed to provide an accurate & reliable diagnosis of autism
- Provides standard scores, percentile ranks, severity level & probablitlity of autism
- Two major overhauls (GARS, GARS-2)
- Based on the DSM-5
Purpose & Nature of the Test
Purpose & Nature
- 58 items sectioned into 6 subscales
- Identify & Assess individuals between the ages of 3-22
- Examiner selects a rater to administer the test (normally a parent or teacher)
Text
- Restricted/Repretitive Behaviors
- Social Interaction
- Social Communication
- Emotional Responses
- Cognitive Style
- Maladaptive Speech
Text
Pictures
Development & Standardization
Development & Standardization
- Normed on a sample of 1,859 individuals
- 61.3% (1,139) only diagnosed with autism
- 38.75% (720) comorbid Autism Spectrum Disorder
- Correlated with data from the U.S. Census
Demographics
Table 1.1
Stratified Educational Attainment of Parents
Table 1.2
Practical Evaluation
Practical Evaluation
- The GARS-3 manual is comprehensive in the areas of reliability & validity
- The preface, sections 1, 2, and 4 are straightfoward in terms of readability
- Sections 5 & 6 may require prerequisite knowledge to the average person
Technical Evaluation
Technical Evaluation
- Selection of the standardization sample based on Census data from 2010
- For reliability 3 types of correlation coefficients were determined: coefficient alpha, test-retest and interrater reliability.
- For validity 3 types were utilized: content-description validity, criterion-prediction validity and construct-identification validity.
Test Reviews
Test Reviews
- 3 different peer reviews
- J. Atlas
- T. Hutchins
- B.C. Karren
- Strengths & Weaknesses
Summary
Summary
- Thorough evidence of the instrument's reliability and validity
- Underrepresentation of minority groups and women
- The educational level of the parents that were used to norm the study.
References
Atlas, J. (2017). Test review of the Gilliam Autism Rating Scale - Third Edition, J.F. Carlson, K.F. Geisinger, & J.L. Jonson (Eds.), The Twentieth Mental Measurements Yearbook [electronic version]. Retrieved
Gilliam, J.E., (2013). Gilliam Autism Rating Scale: Third Edition (GARS-3) [Screening Tool].
Austin, TX: PRO-ED
Hutchins, T. (2017). Test Review of the Gilliam Autism Rating Scale - Third Edition. J.F. Carlson, K.F. Geisinger, & J.L Jonson (Eds.), The Twentieth Mental Measurements Yearbook [electronic version]. Retrieved
Karren, B.C. (2017). A Test Review: Gilliam, J.E. (2014). Gilliam Autism Rating Scale - Third Edition (GARS-3) Journal of Psychoeducational Assessment, v35 n3 p342-346 Jun 2017. 5 pp. doi: http://dx.doi.org/10.1177/0734282916635465