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Prevalence of the tic disorders and Tourette syndrome in a Swedish school population
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Women's and Children's Health.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Child and Adolescent Psychiatry.ORCID iD: 0000-0003-3975-0063
2003 (English)In: Developmental Medicine & Child Neurology, ISSN 0012-1622, E-ISSN 1469-8749, Vol. 45, no 5, 315-319 p.Article in journal (Refereed) Published
Abstract [en]

The aim of the study was to find the epidemiological distribution of tic disorders and Tourette syndrome (TS) in Swedish school children aged 7 to 15 years. A total population of 4,479 children and their parents were asked to fill in a questionnaire covering both motor and vocal tics. A three-stage procedure was used: screening, interview, and clinical investigation. Two hundred and ninety-seven children (190 males, 107 females) were found to have tics. TS, according to DSM-IV criteria, was found in 0.6% of the total population, another 0.8% had chronic motor tics, and 0.5% had chronic vocal tics. Further, 4.8% of the children had transient tics. All together 6.6% of 7- to 15-year-old children currently had or had experienced some kind tic disorder during the last year. Prevalence of different tic disorders was higher among younger children and in males, and was highly associated with school dysfunction. The prevalence of TS was higher than was previously thought but other tic disorders were more common in this childhood population.

Place, publisher, year, edition, pages
2003. Vol. 45, no 5, 315-319 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-94003DOI: 10.1111/j.1469-8749.2003.tb00402.xPubMedID: 12729145OAI: oai:DiVA.org:uu-94003DiVA: diva2:167682
Available from: 2006-02-16 Created: 2006-02-16 Last updated: 2017-10-18Bibliographically approved
In thesis
1. Tourette Syndrome and Tic Disorders in a Swedish School Population: Prevalence, Clinical Assessment, Background, Psychopathology, and Cognitive Function
Open this publication in new window or tab >>Tourette Syndrome and Tic Disorders in a Swedish School Population: Prevalence, Clinical Assessment, Background, Psychopathology, and Cognitive Function
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A total population of 4,479 children (7-15 years of age) attended school in Ludvika & Smedjebacken in 2000. All the school children and their parents were asked to fill in a questionnaire concerning different tics A three-stage procedure was used: tic identification, interview, and clinical assessment.

Tourette syndrome, according to DSM IV criteria was found in 25 (0.6%) of the children, another 34 (0.8%) suffered from chronic motor tics (CMT), 24 (0.4%) from chronic vocal tics (CVT) and 214 (4.8%) children had had transient tics (TT) during the last year. Altogether 297 (6.6%) children had or had had some tic disorder.

Twenty-five controls without tics and 25 children with TT of the same age, sex and school as the TS children were randomly chosen. They were together with the 34 children with CMT and the 24 children with CVT examined with use of a broad battery of instruments.

The mean age of the first symptoms of TS was significantly lower than the onset of chronic motor/vocal tics. A younger age of onset of TS indicated more severe tics. Eighty per cent had a first-degree relative with a psychiatric disorder such as tic disorder, obsessive-compulsive behaviour, attentiondeficit/hyperactivity disorder (ADHD), or depression. A non-significant increase with regard to reduced optimality score in the pre-, peri-, or neonatal periods was found in children with TS compared to controls. No differences were found concerning socio-economic status. Psychiatric comorbid disorders were found in 92% of the children with TS. ADHD was most common. Patterns of psychiatric comorbidity were similar in children with TS and CVT. Children with TS perform poorer than the population in general with respect to cognitive functioning and self-perception.

The results are discussed as they relate to the need for case identification, diagnosis, intervention, and treatment.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 68 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 105
Keyword
Child and adolescent psychiatry, Tourette syndrome, tic disorders, population study, psychopathology, heredity, perinatal complications, cognitive function, Barn- och ungdomspsykiatri
National Category
Psychiatry
Research subject
Child and Youth Psychiatry
Identifiers
urn:nbn:se:uu:diva-6334 (URN)91-554-6460-2 (ISBN)
Public defence
2006-03-10, Auditoriet, Gustavianum, Akademi gatan 3, 753 10 Uppsala, 09:15
Opponent
Supervisors
Available from: 2006-02-16 Created: 2006-02-16 Last updated: 2013-09-19Bibliographically approved

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