Limited-Duration Prevalence
Limited-Duration Prevalence represents the proportion of people alive on a certain day who had a diagnosis of the
disease within the past x years (e.g. x = 5, 10 or 20 years). Registries of shorter duration, less than 40 or 50 years of
data collection, can only estimate
limited-duration prevalence.
Limited-duration
prevalence can be further classified into periods from year of diagnosis. Thus, the 20-years prevalence can be further classified
into the prevalence of those diagnosed in the last 0 to < 5 years, 5 to < 10 years, 10 to < 15 years, and 15 to < 20 years.
NCI's SEER Program has information on cancer cases since 1973; however,
prevalence calculations usually begin in 1975 due to a different number of registries participating in years 1973-1974.
Thus a maximum of 25-year prevalence can be estimated from SEER using data from 1975 through 1999.
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