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Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Connexin 26 anomaly as a "rare disease". More information about Connexin 26 anomaly is available from Orphanet
The term 'prevalence' of Connexin 26 anomaly usually refers to the estimated population
of people who are managing Connexin 26 anomaly at any given time.
The term 'incidence' of Connexin 26 anomaly refers to the annual diagnosis rate,
or the number of new cases of Connexin 26 anomaly 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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