The attack rate is a measure used in epidemiology to describe the proportion of a population that becomes infected or develops a disease during a specific period, especially in relation to a known exposure. It is particularly useful for assessing the risk associated with a particular outbreak or exposure event. The formula is straightforward:
Attack Rate = (Number of cases in a population exposed to a risk factor) / (Total number of individuals exposed to the risk factor)
It is often expressed as a percentage.
function calculateAttackRate() {
var exposedPopulation = parseFloat(document.getElementById("exposedPopulation").value);
var casesExposed = parseFloat(document.getElementById("casesExposed").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(exposedPopulation) || isNaN(casesExposed)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (exposedPopulation <= 0) {
resultDiv.innerHTML = "Total exposed population must be greater than zero.";
return;
}
if (casesExposed exposedPopulation) {
resultDiv.innerHTML = "Number of cases cannot exceed the total exposed population.";
return;
}
var attackRate = (casesExposed / exposedPopulation) * 100;
resultDiv.innerHTML = "