Limited-Duration Prevalence Session

Prevalence is a statistic of primary interest in public health because it identifies the level of burden of disease or health-related events on the population and health care system. Prevalence represents new and pre-existing cases alive on a certain date, in contrast to incidence, which reflects new cases of a disease diagnosed during a given period of time. Prevalence is a function of both the incidence of the disease and survival.


Limited-Duration Prevalence represents the number of people alive on a certain day who had a diagnosis of the disease within the past x years. SEER*Stat's prevalence calculations use the counting method to estimate prevalence from incidence and follow-up data. The counting method estimates prevalence by counting the number of persons who are known to be alive at a specific calendar time and adjusting for those lost to follow-up. For information on other methods for calculating prevalence, or estimating complete from limited-duration prevalence, please visit:


See Statistics Calculated by SEER*Stat for an overview of the statistics that can be calculated in other types of sessions.


It is recommended that you work through a Limited-Duration Prevalence session in the following order.

  1. Create or open a Limited-Duration Prevalence session

  2. Data tab

  3. Selection tab

  4. Statistic tab

  5. Table tab

  6. Survival Cohorts tab

  7. Output tab

  8. Execute the Session

  9. View the output in a results matrix