RAMON VELEZ, M.D., M.SC.; KATHRYN MAGRUDER-HABIB, PH.D.
To the editor: Little is known about the incidence and prevalence of severe von Willebrand's disease. A recent publication, however, has provided some of the first population-based data on the disease for the United States, Canada, and Europe (as well as Israel and Iran) (1). Although the report mislabeled the data as incidence, what is actually calculated is prevalance, that is, the number of existing cases of disease divided by the total population at a designated point in time (2).
Capitalizing on the relation between incidence and prevalence (3), where the incidence rate = prevalence ratio/(average duration of disease [1
VELEZ R, MAGRUDER-HABIB K. Severe von Willebrand's Disease: Incidence and Prevalence. Ann Intern Med. ;100:465. doi: 10.7326/0003-4819-100-3-465_1
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Published: Ann Intern Med. 1984;100(3):465.
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