Prevalence and Incidence of Chromosome 4 Ring

Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Chromosome 4 Ring as a "rare disease". More information about Chromosome 4 Ring is available from Orphanet

About prevalence and incidence statistics:

The term 'prevalence' of Chromosome 4 Ring usually refers to the estimated population of people who are managing Chromosome 4 Ring at any given time. The term 'incidence' of Chromosome 4 Ring refers to the annual diagnosis rate, or the number of new cases of Chromosome 4 Ring 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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