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Cumulative Incidence Calculator

Formula

To calculate the cumulative incidence:

$CI = \frac{NC}{TP}$

Where:

$CI$ is the cumulative incidence
$NC$ is the number of new cases of a disease
$TP$ is the total population at risk

What is Cumulative Incidence?

Cumulative incidence is a ratio of the number of new cases of a disease to the total population that could be exposed to the disease. It is used to measure the risk of developing a disease over a specified period of time.

Example Calculation 1

Let's assume the following values:

Number of New Cases ( $NC$ ) = 50
Total Population at Risk ( $TP$ ) = 1000

Using the formula:

$CI = \frac{50}{1000} = 0.05$

The Cumulative Incidence is 0.05.

Example Calculation 2

Let's assume the following values:

Number of New Cases ( $NC$ ) = 200
Total Population at Risk ( $TP$ ) = 5000

Using the formula:

$CI = \frac{200}{5000} = 0.04$

The Cumulative Incidence is 0.04.