This is easily accomplished because census data by sex are readily available. For example, if the numerator represents new cases of cancer of the ovaries, the denominator should be restricted to women, because men do not have ovaries.
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The denominator should be limited to the “population at risk” for developing disease, i.e., persons who have the potential to get the disease and be included in the numerator. The denominator of an incidence proportion is the number of persons at the start of the observation period. Because all of the persons with new cases of disease (numerator) are also represented in the denominator, a risk is also a proportion. The denominator is the number of persons in the population at the start of the observation period. As a measure of incidence, it includes only new cases of disease in the numerator.
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Calculate the risk of death for these men. EXAMPLES: Calculating Incidence Proportion (Risk)Įxample A: In the study of diabetics, 100 of the 189 diabetic men died during the 13-year follow-up period.