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
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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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    • "Tic severity over the previous week was assessed using the Yale Global Tic Severity Scale (YGTSS), a clinician-rated scale with demonstrated excellent reliability and validity (Leckman, Riddle, Hardin, & Ort, 1989; Storch et al., 2005). The YGTSS includes a symptom checklist of 40 commonly reported motor and vocal tics and yields four tic severity scores: Total Motor and Total Phonic Score (range 0-25), Total Tic Score (range 0-50), and "
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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 · 2.47 Impact Factor
    • "Clinical measures of symptom severity administered on the day of the session included the following: • • The Yale Global Tic Severity Scale (YGTSS; Leckman et al., 1989) is used to rate the type, frequency, duration, intensity, and complexity of motor and vocal tics, and also provides an overall impairment score and a global (motor + vocal + overall impairment) tic severity score. Good psychometric properties have been reported for the use of YGTSS in children and adolescents with TS, including internal consistency , convergent validity and association with clinician ratings of TS impairment (Leckman et al., 1989; Storch, Murphy, Geffken, Sajid, & Allen, 2005). "
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    ABSTRACT: In light of descriptive accounts of attenuating effects of physical activity on tics, we used an experimental design to assess the impact of an acute bout of aerobic exercise on tic expression in young people (N = 18) with Tourette Syndrome (TS). We compared video-based tic frequency estimates obtained during an exercise session with tic rates obtained during pre-exercise (baseline) and post-exercise interview-based sessions. Results showed significantly reduced tic rates during the exercise session compared with baseline, suggesting that acute exercise has an attenuating effect on tics. Tic rates also remained reduced relative to baseline during the post-exercise session, likely reflecting a sustained effect of exercise on tic reduction. Parallel to the observed tic attenuation, exercise also had a beneficial impact on self-reported anxiety and mood levels. The present findings provide novel empirical evidence for the beneficial effect of exercise on TS symptomatology bearing important research and clinical implications.
    Behavior modification 04/2014; 38(2). DOI:10.1177/0145445514532127 · 2.23 Impact Factor
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