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


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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    ABSTRACT: Over the past six decades, behavior therapy has been a major contributor to the development of evidence-based psychotherapy treatments. However, a long-standing concern with behavior therapy among many nonbehavioral clinicians has been the potential risk for symptom substitution. Few studies have been conducted to evaluate symptom substitution in response to behavioral treatments, largely due to measurement and definitional challenges associated with treated psychiatric symptoms. Given the overt motor and vocal tics associated with Tourette's disorder, it presents an excellent opportunity to empirically evaluate the potential risk for symptom substitution associated with behavior therapy. The present study examined the possible presence of symptom substitution using four methods: (a) the onset of new tic symptoms, (b) the occurrence of adverse events, (c) change in tic medications, and (d) worsening of co-occurring psychiatric symptoms. Two hundred twenty-eight participants with Tourette's disorder or persistent motor or vocal tic disorders were randomly assigned to receive behavioral therapy or supportive therapy for tics. Both therapies consisted of eight sessions over 10 weeks. Results indicated that participants treated with behavior therapy were not more likely to have an onset of new tic symptoms, experience adverse events, increase tic medications, or have an exacerbation in co-occurring psychiatric symptoms relative to participants treated with supportive therapy. Further analysis suggested that the emergence of new tics was attributed with the normal waxing and waning nature of Tourette's disorder. Findings provide empirical support to counter the long-standing concern of symptom substitution in response to behavior therapy for individuals with Tourette's disorder.
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    • "The YGTSS has demonstrated acceptable internal consistency and acceptable convergent and divergent validity (Leckman et al., 1989). Factor analyses have revealed a two-factor structure (motor tics and vocal tics; Leckman et al., 1989; Storch et al., 2005). "
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    ABSTRACT: Although tics are the defining feature of chronic tic disorders (CTD), many children experience comorbid internalizing and externalizing problems that contribute to impairment across several domains, including family functioning. The current study examined clinical correlates and predictors of caregiver strain in parents of children with CTD. Participants were 123 children and adolescents diagnosed with a CTD who participated in a randomized-controlled trial of behavior therapy for reducing tics. Results showed that a combination of disruptive behavior, inattention/hyperactivity, and tic intensity best explained objective strain, and a combination of inattention/hyperactivity and tic intensity were the best predictors of subjective caregiver strain. Implications of these findings for care providers are discussed.
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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.
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