Alopecia epidemiology and demographics
Alopecia epidemiology and demographics On the Web
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The epidemiology and demographics of alopecia vary by the type of alopecia as well as the age, race, sex, hygiene, hair care habits, and health status of an individual. For example, in androgenetic alopecia, which has the highest prevalence of all the types of alopecia 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 alopecia areata, sex plays no role  but fair-skinned races are more commonly affected and the prevalence is about 100-200 per 100,000 individuals  .
Epidemiology and Demographics
- Androgenetic alopecia is believed to have a worldwide prevalence of about 50,000 per 100,000 men and 15,000 per 100,000 women with post-menopausal women making up the majority. 
- Alopecia areata has a prevalence of 100-200 per 100,000 individuals,   and a risk of about 2% over an individual's life.  . The mean age for diagnosis of alopecia areata is 32 years in males and 36 years in females based on a study of the population of Olmsted County, Minnesota which was done between 1990 to 2009 .
- Only limited studies on the prevalence of trichotillomania have been performed and these were done among U.S. university students, Israeli adolescents, and older adults within the same community. The prevalence was between 500 per 100,000 to 2000 per 100,000.   
- Traction alopecia is more commonly seen among black populations with females being affected more often than males at a rate of about 31,000-32,000 per 100,000 women compared to about 2,300 per 100,000 men. Traction alopecia was seen in 18,000 per 100,000 girls between the ages of 5.4 to 14.3 years based on a study of African-American girls. An 8-month old girl was the youngest reported case in the study. 
- Although considered to be a relatively common condition, the precise prevalence of telogen effluvium remains unknown. 
- The overall incidence of alopecia areata is approximately 20.2 per 100,000 person-years. 
- About 50,000 per 100,000 Caucasian males have androgenetic alopecia by the time they are 50 years old. This number rises to about 80,000 per 100,000 by the age of 70 years. 
- The incidence of cutaneous lupus erythematosus is about 4.2 per 100,000 individuals, with the incidence being higher in males. 
- Tinea capitis is more common among children and adolescents than in adults. 
- The risk of androgenetic alopecia increases with age. Up to 80,000 per 100,000 Caucasian men over the age of 70 years have androgenetic alopecia compared to 50,000 per 100,000 in Caucasian men who are 50 years.
- Although the link between age and risk of telogen effluvium is currently unclear, it has been observed that elderly women are more susceptible to telogen effluvium after sustaining severe trauma or bleeding, having a high fever, or going through psychological stress.  Studies have reported the incidence of telogen effluvium in children to be around 2.7%. 
- In telogen effluvium, women are at higher predisposition than men.
- Alopecia areata can occur in adults and children and distribution is about equal between the sexes .
- Traction alopecia is seen most commonly in females, the majority of whom are of African-American descent. 
- Cutaneous lupus erythematosus is more common in males than in females, with a ratio of about 59.4 per 100,000 versus 1.6 per 100,000. 
- Traction alopecia is seen most commonly in African-American females. This is likely as a result of certain hairstyles that are more predominantly made by African-Americans. 
- Caucasian males have the highest incidence of androgenetic alopecia. They are followed by Asian males, African-American males, and lastly, Native Americans and Eskimos. 
- Tinea capitis has a higher incidence among darker races. 
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