TN is a rare condition that affects women more than men. The annual incidence of TN is 4 to 13 per 100,000 people.Despite its low incidence, numbers may be significantly higher due to frequent misdiagnosis. TN is one of the more frequently seen<unk> s in the older adult population. The incidence increases gradually with age; most idiopathic cases begin after age 50, although onset may occur in the second and third decades or, rarely, in children.
The male-to-female prevalence ratio of TN ranges from 1:1.5 to 1:1.7. This female predominance may be related to the increased longevity of women compared with men. Rare familial cases have been reported, but the vast majority of patients have sporadic disease.
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