Multiple motor and phonic tics present for 12 months.
A diagnosis of
Tourettes syndrome requires multiple motor and phonic tics to be present
for at least a year.7 This time frame helps to distinguish Tourettes
syndrome from transient tic disorders, which often require no treatment,
and isolated chronic motor or phonic tics. The many behavioral symptoms
and disorders associated with Tourettes syndrome can hinder accurate and
efficient diagnosis of the disorder.
REFERENCE 7. Robertson MM. Tourette syndrome, associated conditions and
the complexities of treatment. Brain 2000;123(Pt 3):425-62.