HMB342H1 Lecture Notes - Lecture 3: Cohort Study, Cumulative Incidence, Prevalence

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19 Apr 2016
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Fraction or proportion of a group of people initially free of the outcome of interest that develops the condition over a given period of time: cumulative incidence new cases that accumulate over time. Incidence density (person-years) number of new cases emerging in an ever-changing population, one in which individuals are under study and susceptible for varying lengths of time. Prevalence time is assumed to be instantaneous; whereas incidence time is the interval during which susceptible people were observed for the emergence of the event of interest. Prevalence answers: what proportion of a group of people has a condition? ; whereas incidence answers: at what rate do new cases arise in a defined population as time passes? : characteristic. New cases occurring during a period of time among a group initially free of disease. All susceptible people without disease at the beginning of the period. Existing cases at a point or period of time.

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