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example for cumulative incidence(Risk)...... Number of new cases/Population at risk 28 patient in two years/1000 person at risk which means 2.8%

the IR for the same example 14 patient / 1 year

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Q: Difference between cumulative incidence and incidence rate?
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What is the formula for cumulative incidence difference?

RD=Re-Ru Rate Difference=Rate of exposed group-Rate of unexposed group.


What it cumulative incidence rate?

Cumulative incidence is a measure of frequency, as in epidemiology where it is a measure of disease frequency during a period of time. Cumulative incidence is the incidence calculated using a period of time during which all of the individuals in the population are considered to be at risk for the outcome. It is sometimes referred to as the incidence proportion or the attack rate. Cumulative incidence is calculated by the number of new cases during a period divided by the number of people at risk in the population at the beginning of the study. Cumulative incidence is a measure of frequency, as in epidemiology where it is a measure of disease frequency during a period of time. Cumulative incidence is the incidence calculated using a period of time during which all of the individuals in the population are considered to be at risk for the outcome. It is sometimes referred to as the incidence proportion or the attack rate. Cumulative incidence is calculated by the number of new cases during a period divided by the number of people at risk in the population at the beginning of the study.


What is difference between attack rate and incidence rate?

Attack rate is the proportion of exposed that become ill. Incidence rate is the number of new cases that become ill over a certain period of time.


What is the formula to calculate cumulative incidence rate?

CI(t)=1-e-IR(t)*D


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