Reliability and validity of the Yale Global Tic Severity Scale.

Department of Pediatrics, University of Florida, Gainesville, 32610, USA.
Psychological Assessment (Impact Factor: 2.99). 01/2006; 17(4):486-91. DOI: 10.1037/1040-3590.17.4.486
Source: PubMed

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.

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    • "). The YGTSS is a clinician-rated semi-structured interview with demonstrated reliability and validity that measures tic symptom severity over the previous week (Leckman et al., 1989; Storch et al., 2005). The YGTSS produces a Total Tic Score (range: 0–50), and a Total Impairment Score (range: 0–50), with higher rating indicating greater tic severity and impairment, respectively. "
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    ABSTRACT: Pharmacological and behavioral interventions have focused on reducing tic severity to alleviate tic-related impairment for youth with chronic tic disorders (CTDs), with no existing intervention focused on the adverse psychosocial consequences of tics. This study examined the preliminary efficacy of a modularized cognitive behavioral intervention ("Living with Tics", LWT) in reducing tic-related impairment and improving quality of life relative to a waitlist control of equal duration. Twenty-four youth (ages 7-17 years) with Tourette Disorder or Chronic Motor Tic Disorder and psychosocial impairment participated. A treatment-blind evaluator conducted all pre- and post-treatment clinician-rated measures. Youth were randomly assigned to receive the LWT intervention (n=12) or a 10-week waitlist (n=12). The LWT intervention consisted of up to 10 weekly sessions targeted at reducing tic-related impairment and developing skills to manage psychosocial consequences of tics. Youth in the LWT condition experienced significantly reduced clinician-rated tic-impairment, and improved child-rated quality of life. Ten youth (83%) in the LWT group were classified as treatment responders compared to four youth in the waitlist condition (33%). Treatment gains were maintained at one-month follow-up. Findings provide preliminary data that the LWT intervention reduces tic-related impairment and improves quality of life for youth with CTDs. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.
    Psychiatry Research 12/2014; 225(3). DOI:10.1016/j.psychres.2014.11.045 · 2.68 Impact Factor
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    • "The presence and severity of tics among participants was assessed using the Yale Global Tic Severity Scale (YGTSS; Leckman et al., 1989). The YGTSS is a clinician-rated scale with demonstrated reliability and validity designed to measure tic severity over the previous week (Leckman et al., 1989; Storch et al., 2005). The initial section of the YGTSS consists of a checklist of 40 possible tics separately categorized as simple motor, complex motor, simple vocal and complex vocal. "
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    ABSTRACT: Cluster analytic methods have examined the symptom presentation of chronic tic disorders (CTDs), with limited agreement across studies. The present study investigated patterns, clinical correlates, and treatment outcome of tic symptoms. 239 youth and adults with CTDs completed a battery of assessments at baseline to determine diagnoses, tic severity, and clinical characteristics. Participants were randomly assigned to receive either a comprehensive behavioral intervention for tics (CBIT) or psychoeducation and supportive therapy (PST). A cluster analysis was conducted on the baseline Yale Global Tic Severity Scale (YGTSS) symptom checklist to identify the constellations of tic symptoms. Four tic clusters were identified: Impulse Control and Complex Phonic Tics; Complex Motor Tics; Simple Head Motor/Vocal Tics; and Primarily Simple Motor Tics. Frequencies of tic symptoms showed few differences across youth and adults. Tic clusters had small associations with clinical characteristics and showed no associations to the presence of coexisting psychiatric conditions. Cluster membership scores did not predict treatment response to CBIT or tic severity reductions. Tic symptoms distinctly cluster with little difference across youth and adults, or coexisting conditions. This study, which is the first to examine tic clusters and response to treatment, suggested that tic symptom profiles respond equally well to CBIT. Clinical identifiers: NCT00218777; NCT00231985.
    Psychiatry Research 12/2013; 210(3):1198-204. DOI:10.1016/j.psychres.2013.09.021 · 2.68 Impact Factor
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    • "The YGTSS is a semistructured instrument that evaluates motor and vocal tics (Leckman et al. 1989; Storch et al. 2005). The presence of tics is based on parent report and clinician's behavioral observations. "
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