Transcription of Calculating Prevalences and Incidences
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Calculating Prevalences and Incidences
Page 1 of C:\DATA\HS161\ Prevalences and = no. of casespopulation can be measured in an closed cohort or in an open in Old cases and new cases are counted in the be measured at a particular point (point prevalence) or over a period (period prevalence). Normally,when we say prevalence we mean point prevalence. proportion = Cumulative Incidence = Risk = no. of disease onsetsno. initially at proportion can only be measured in a closed new onsets are time of follow-up must be specified ( , 5-year risk of breast cancer vs. lifetime risk of breast cancer). rate = Incidence density = no. of disease onsetsSum of person-time @ rates (density) can be measured in a closed cohort or in an open numerator is the same as incidence proportion, but its denominator is different.
Prevalence in cross-sectional. c. “Old” cases and “new” cases are counted in the numerator. d. Can be measured at a particular point (point prevalence) or over a period (period prevalence). ... (N )(∆t), where N is average population size and ∆t is the duration of study. For example, a population with an average size of 1000 studied ...
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