how does prevelance proportions differ from an incidence rate? which one of thes

Question

how does prevelance proportions differ from an incidence rate? which one of these two indicators is better to use when we estimate the future risk of breast cancer among women aged 50-65? which one of these two indicators is better to use when we estimate the number of surgeon to treat breast cancer for the state of ohio how does prevelance proportions differ from an incidence rate? which one of these two indicators is better to use when we estimate the future risk of breast cancer among women aged 50-65? which one of these two indicators is better to use when we estimate the number of surgeon to treat breast cancer for the state of ohio how does prevelance proportions differ from an incidence rate? which one of these two indicators is better to use when we estimate the future risk of breast cancer among women aged 50-65? which one of these two indicators is better to use when we estimate the number of surgeon to treat breast cancer for the state of ohio

Explanation / Answer

Prevalence is the number of cases of the disease present in the population at a particular point of time, where as incidence rate is the number of new cases reported in a non affected population during a time period. Assume that 10 of 1000 women in a county have breast cancer at Jan 1 of 2018 and 5 more reported breast cancer between Jan 1 and 31st Dec 2018, then 10/1000 x 100

= 1% is the prevalence

Incidence rate = 5/(1000-10) x 100

= 0.505%

To estimate future risk, we need to you incidence rate.

To estimate number of surgeons required, we need the number of cases at a particular point and hence, for that we need prevalence.

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