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Factor-analytic study of the Yale Global Tic Severity Scale
Eric A Storch1, Tanya K Murphy, Melanie Fernandez
1Department of Psychiatry, University of Florida, Gainesville, FL 32610, USA. estorch@psychiatry.ufl.edu
Psychiatry Research
|December 8, 2006
Summary
The Yale Global Tic Severity Scale effectively measures tic severity in children and adolescents. Its original scoring structure is validated for assessing pediatric tic disorders.
Area of Science:
- Child and Adolescent Psychiatry
- Neurodevelopmental Disorders
- Psychometrics
Background:
- Tic disorders, including Tourette's Disorder, significantly impact children and adolescents.
- Accurate assessment of tic severity is crucial for diagnosis and treatment.
- The Yale Global Tic Severity Scale (YGTSS) is a widely used clinical rating scale.
Purpose of the Study:
- To examine the factor structure of the Yale Global Tic Severity Scale (YGTSS).
- To evaluate the internal consistency and validity of the YGTSS in a pediatric population.
- To confirm the suitability of the original YGTSS scoring for clinical use.
Main Methods:
- Factor analysis was performed on data from 76 children and adolescents with tic disorders.
- Internal consistency of the identified factors was assessed.
- Convergent and divergent validity was examined using parent ratings of Tourette's Disorder symptoms.
Main Results:
- The factor structure proposed by Leckman et al. demonstrated an adequate fit for the YGTSS.
- Acceptable internal consistency was found for the scale's factors.
- Correlations with parent ratings supported the convergent and divergent validity of the YGTSS.
Conclusions:
- The findings support the reliability and validity of the Yale Global Tic Severity Scale.
- The original scoring structure of the YGTSS is appropriate for assessing tic severity in pediatric populations.
- The YGTSS is a valuable tool for clinicians evaluating tic disorders in youth.
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