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.
a. Prevalence can be measured in an closed cohort or in an open population. b. 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). Normally, when we say prevalence we mean “point prevalence.” 2.
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