Overall, tic disorders occur more commonly in children than in adults and more so in males than in females. They are observed with higher frequency in special education populations.[1][6][7] Provisional tic disorders (lasting <1 year) appear to be very common in childhood and have been estimated to occur in up to 20% of primary school children.[8][9] Chronic tic disorder (motor or phonic tics for >1 year) occurs less commonly; population-based surveys indicate that the prevalence of chronic tic disorders is 1% to 3%.[2][10] Tourette's syndrome (multiple motor and at least one phonic tic for >1 year) has a population-based prevalence in children of 0.3% to 0.9%;[11] prevalence is higher in males, with a male to female ratio of 3:1,[6] and the mean age of onset is between 6 and 7 years.[2][7] Tourette's syndrome in the US is diagnosed more commonly in non-Hispanic white young people than in Hispanic and non-Hispanic black young people.[12][13]

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