Prevalence and Incidence of Hemifacial microsomia macrodactyly

Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Hemifacial microsomia macrodactyly as a "rare disease". More information about Hemifacial microsomia macrodactyly is available from Orphanet

About prevalence and incidence statistics:

The term 'prevalence' of Hemifacial microsomia macrodactyly usually refers to the estimated population of people who are managing Hemifacial microsomia macrodactyly at any given time. The term 'incidence' of Hemifacial microsomia macrodactyly refers to the annual diagnosis rate, or the number of new cases of Hemifacial microsomia macrodactyly diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.

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