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Related Experiment Videos

An epidemiological study of tics.

F Nomoto1, Y Machiyama

  • 1Department of Neuropsychiatry, Gunma University School of Medicine, Japan.

The Japanese Journal of Psychiatry and Neurology
|December 1, 1990
PubMed
Summary
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This study investigated tic disorders in children, finding higher prevalence in boys. It established prevalences for various tics and diagnosed Tourette disorder in 0.5% of participants.

Area of Science:

  • Neuroscience
  • Child Psychiatry
  • Epidemiology

Background:

  • Tic disorders are neurological conditions affecting children.
  • Accurate prevalence data is crucial for understanding and managing these disorders.
  • Existing diagnostic criteria require careful application in epidemiological studies.

Purpose of the Study:

  • To estimate the prevalence of various tics and tic disorders in a pediatric population.
  • To differentiate between transient tic disorder (TTD), chronic motor or vocal tic disorder (CMVTD), and Tourette disorder (TD).
  • To assess gender differences in tic disorder prevalence.

Main Methods:

  • Development and application of a parent-reported questionnaire for tic estimation.
  • A two-step investigation involving an initial questionnaire (1,218 responses) followed by confirmatory telephone interviews (197 positive responses).

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  • Classification of participants based on DSM-III-R criteria for TTD, CMVTD, and Tourette disorder.

    • Main Results:

    • Overall estimated tic prevalence was 11.3% in boys and 5.2% in girls.
    • Specific tic prevalences included blinking (4.2%), head-jerking (1.6%), throat-clearing (2.7%), and others.
    • Diagnosed prevalences were 5.1% for TTD, 2.2% for CMVTD, and 0.5% for Tourette disorder.

    Conclusions:

    • The study provides valuable epidemiological data on tic disorders in children.
    • Boys exhibit a higher prevalence of tic disorders compared to girls.
    • The findings underscore the importance of standardized diagnostic procedures for accurate assessment.