Development of the Korean Form of Yale Global Tic Severity Scale: A Validity and Reliability Study

Chung, Sun Ju; Lee, Jeoung Seop; Yoo, Tae Ik; Koo, Young Jin; Jeon, Seong Ill; Kim, Bong Seok; Hong, Kang E

Abstract

OBJECTIVES
This study was carried out to develop the Korean form of Yale Global Tic Severity Scale(YGTSS)-family & clinical rating version. The severity of motor and phonic tics was rated according to five separate dimensions : number, frequency, intensity, complexity,and interference.
METHODS
The Korean form of YGTSS was applied to 100 children who visited psychiatric outpatient clinic with chief complaints of tic symptom. Together with YGTSS, Clinical Global Impression for Tourette's syndrome(CGI-TS), Obsessive-Compulsive disorder(CGI-OCD), At tention-Deficit/Hyperactivity Disorder(CGI-ADHD) were administered to all subjects for examining convergent and discriminant validities.
RESULTS
We could confirm high internal consistency, convergent and discriminant validities and interrater reliability of YGTSS by analysing data from 100 children with tic disorder. In factor analysis, items were clusterd to 2 factors which were identical motor and phonic tic subscales.
CONCLUSION
: The results of this study indicate that the Korean form of YGTSS is a reliable and valid rating scale for rating tic symptom severity. It can be used to evaluate tic symptom objectively and to quantify the tic severity in the studies for tic disorder.