Prevalence and Incidence of Roberts syndrome
Roberts syndrome: Rare Disease
Roberts syndrome is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Roberts syndrome, or a subtype of Roberts syndrome,
affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners,
currently defines a condition rare when if affects 1 person per 2,000.
They list Roberts syndrome as a "rare disease".
More information about Roberts syndrome is available from Orphanet
About prevalence and incidence statistics:
The term 'prevalence' of Roberts syndrome usually refers to the estimated population
of people who are managing Roberts syndrome at any given time.
The term 'incidence' of Roberts syndrome refers to the annual diagnosis rate,
or the number of new cases of Roberts syndrome 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.