title: Reliability and validity of the Yale Global Tic Severity Scale.
abstract: To investigate the reliability and validity of the Yale Global Tic Severity Scale (YGTSS), 28 youth aged 6 to 17 years with Tourette's syndrome (TS) participated in the study. Data included clinician reports of tics and obsessive-compulsive disorder (OCD) severity, parent reports of tics, internalizing and externalizing problems, and child reports of depression and anxiety. All children participated in a 2nd YGTSS administration by the same rater 48 days later. Good internal consistency and stability were found for the YGTSS scores. YGTSS scores demonstrated strong correlations with parent-rated tic severity (r = .58-.68). YGTSS scores were not significantly related to measures of clinician ratings of OCD severity (r = .01-.15), parent ratings of externalizing and internalizing behavior (r = -.07-.20), and child ratings of depression (r = .02-.26) and anxiety (r = -.06 -.28). Findings suggest that the YGTSS is a reliable and valid instrument for the assessment of pediatric TS.
authors.affiliation: Department of Pediatrics, University of Florida, Gainesville, 32610, USA. estorch@psychiatry.ufl.edu
authors.forename: Eric A
authors.initials: EA
authors.lastname: Storch
authors.forename: Tanya K
authors.initials: TK
authors.lastname: Murphy
authors.forename: Gary R
authors.initials: GR
authors.lastname: Geffken
authors.forename: Muhammad
authors.initials: M
authors.lastname: Sajid
authors.forename: Pam
authors.initials: P
authors.lastname: Allen
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Roberti
authors.forename: Wayne K
authors.initials: WK
authors.lastname: Goodman
mesh_terms: D000293:Adolescent; D001008:Anxiety Disorders / Q000175:diagnosis / Q000523:psychology; D002648:Child; D003866:Depressive Disorder / Q000175:diagnosis / Q000523:psychology; D005260:Female; D006801:Humans; D007389:Internal-External Control; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000175:diagnosis / Q000523:psychology; D011594:Psychometrics / Q000379:methods* / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D020323:Tics / Q000175:diagnosis* / Q000523:psychology; D005879:Tourette Syndrome / Q000175:diagnosis* / Q000523:psychology