(GARS-3) Gilliam Autism Rating Scale, Third Edition

James E. Gilliam, PhD

(GARS-3) Gilliam Autism Rating Scale, Third Edition

Benefits

Helps diagnose autism and estimate its severity

Ages

3 to 22 years

Admin Time

5 to 10 minutes

Format

Frequency-based rating scale completed by parent, teacher, or clinician

Norms

Based on a sample of 1,859 individuals representing demographic characteristics of U.S. Census data for 2011

Publish Date

2013

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Call 800.648.8857

Kits

GARS-3 Kit

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Product #: EM-177

GARS-3 Kit

Includes 50 Summary/Response Forms; Examiner’s Manual; Instructional Objectives Manual; all in a sturdy storage box

$163.00

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Forms

GARS-3 Summary/Response Form (Pack of 50)

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Product #: EM-177A

GARS-3 Summary/Response Form (Pack of 50)

$59.00

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Manual and Instructional Objectives

GARS-3 Examiner’s Manual

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Product #: EM-177M

GARS-3 Examiner’s Manual

$73.00

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GARS-3 Instructional Objectives for Individuals Who Have Autism

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Product #: EM-177B

GARS-3 Instructional Objectives for Individuals Who Have Autism

$35.00

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Continuing Education

GARS-3 Manual CE Materials

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Product #: EM-177CE

GARS-3 Manual CE Materials

Includes Questionnaire and Evaluation Form. To receive 2 continuing education (CE) credits for mastering the GARS-3 Manual (EM-177M, sold separately), complete and return these materials.

$26.00

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Spanish Language Form

GARS-3S Spanish Summary/Response Form (Pack of 15)

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Product #: EM-177C

GARS-3S Spanish Summary/Response Form (Pack of 15)

Formulario Resumen/Respuesta

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(GARS-3) Gilliam Autism Rating Scale, Third Edition

(GARS-3) Gilliam Autism Rating Scale, Third Edition

BY JAMES E. GILLIAM, PHD

The Gilliam Autism Rating Scale, Third Edition (GARS-3) helps clinicians identify autism, assess its severity, and determine appropriate intervention. Items in the third edition of this widely used test reflect criteria for diagnosing Autism Spectrum Disorder (ASD) found in the new Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5).

Fifty-six items clearly describe typical behaviors of individuals with ASD, and are grouped into six subscales:

  • Restrictive and Repetitive Behaviors
  • Social Interaction
  • Social Communication
  • Emotional Responses
  • Cognitive Style
  • Maladaptive Speech

Administration of the GARS-3 provides standard scores, percentile ranks, severity level, and probability of autism.

Reliability and Validity

Internal consistency (content sampling) reliability coefficients exceed .85 for the subscales and .93 for the Autism Indexes. Test-retest (time sampling) reliability coefficients exceed .80 for the subscales and .90 for the Autism Indexes.

Interrater reliability intraclass coefficients exceed .80 and .84 for the Autism Indexes. There is very strong correlation between the GARS-3 scores and those of other widely used diagnostic tests for ASD. All-new validity studies show that test results are valid for a wide variety of subgroups as well as for the general population. Binary classification studies indicate that the GARS-3 can be used to accurately discriminate children with ASD from those without (i.e., sensitivity = .97, specificity = .97, ROC/AUC = .93). Theoretical and empirical validity of the subscales is proven through confirmatory and exploratory factor analysis. More information about the validity of the GARS-3 is included in the Examiner's Manual.

New in the GARS-3

Items and subscales reflecting DSM-5 diagnostic criteria for ASD Diagnostic validation form assuring test results meet DSM-5 criteria for ASD Forty-four new items Six subscales that are valid and sensitive for identification of ASD New norms based on a sample of 1,859 individuals representing demographic characteristics of U.S. Census data for 2011 Interpretation guide offering an easy and efficient method for identifying the presence and severity of ASD

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