The epidemiology and demographics of<unk>  vary by the type of<unk>  as well as the age, race, sex, hygiene, hair care habits, and health status of an individual. For example, in androgenetic<unk> , which has the highest prevalence of all the types of<unk>  with about 50,000 per 100,000 men and 15,000 per 100,000 women worldwide, age and sex playing a role shown by the fact that men are more affected than women and post-menopausal women represent the highest proportion among females. In the case of<unk>  areata, sex plays no role  but fair-skinned races are more commonly affected and the prevalence is about 100-200 per 100,000 individuals  .
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