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ABSTRACT: Tourette syndrome is a heterogeneous familial disorder for which the genetic mechanisms are unknown. A better characterisation of the phenotype may help identify susceptibility genes.
To extend previous factor-analytic studies of the syndrome.
Symptom data from 410 people with Tourette syndrome were included in agglomerative hierarchical cluster and principal components analyses.
Five factors were observed, characterised by: (1) socially inappropriate behaviours and other complex vocal tics; (2) complex motor tics; (3) simple tics; (4) compulsive behaviours; and (5) touching self. Individuals with co-occurring attention-deficit hyperactivity disorder had significantly higher factor scores on Factors 1 and 3, whereas individuals with co-occurring obsessive-compulsive disorder and behaviours had significantly higher factor scores for Factors 1-4.
These findings add to the growing body of evidence that Tourette syndrome is not a unitary condition and can be disaggregated into more homogeneous symptom components.
The British Journal of Psychiatry 08/2008; 193(1):31-6. DOI:10.1192/bjp.bp.107.039909 · 7.34 Impact Factor