function calculateHospitalMortality() {
// Get input values using var
var totalDischargesInput = document.getElementById('hmrTotalDischarges');
var totalDeathsInput = document.getElementById('hmrTotalDeaths');
var deathsUnder48Input = document.getElementById('hmrDeathsUnder48');
var resultBox = document.getElementById('hmrResult');
var errorBox = document.getElementById('hmrError');
var grossResult = document.getElementById('grossRateResult');
var netResult = document.getElementById('netRateResult');
// Parse values
var totalDischarges = parseFloat(totalDischargesInput.value);
var totalDeaths = parseFloat(totalDeathsInput.value);
var deathsUnder48 = parseFloat(deathsUnder48Input.value);
// Reset display
resultBox.style.display = 'none';
errorBox.style.display = 'none';
errorBox.innerText = ";
// Validation Logic
if (isNaN(totalDischarges) || isNaN(totalDeaths)) {
errorBox.innerText = "Please enter valid numbers for Discharges and Deaths.";
errorBox.style.display = 'block';
return;
}
if (totalDischarges <= 0) {
errorBox.innerText = "Total Discharges must be greater than zero.";
errorBox.style.display = 'block';
return;
}
if (totalDeaths totalDischarges) {
errorBox.innerText = "Total Deaths cannot be negative or exceed Total Discharges.";
errorBox.style.display = 'block';
return;
}
// Handle optional input
if (isNaN(deathsUnder48)) {
deathsUnder48 = 0;
}
if (deathsUnder48 totalDeaths) {
errorBox.innerText = "Deaths within 48 hours cannot exceed Total Deaths.";
errorBox.style.display = 'block';
return;
}
// Calculate Gross Mortality Rate
// Formula: (Total Deaths / Total Discharges) * 100
var grossRate = (totalDeaths / totalDischarges) * 100;
// Calculate Net Mortality Rate
// Formula: ((Total Deaths – Deaths < 48h) / (Total Discharges – Deaths 0) {
netRate = (netNumerator / netDenominator) * 100;
}
// Display Results
grossResult.innerText = grossRate.toFixed(2) + '%';
netResult.innerText = netRate.toFixed(2) + '%';
resultBox.style.display = 'block';
}
How to Calculate Mortality Rate in Hospital
Calculating hospital mortality rates is a fundamental process in Health Information Management (HIM) and quality assurance. These metrics are used to assess the quality of patient care, benchmark performance against other facilities, and identify areas for clinical improvement. The mortality rate essentially represents the percentage of patients who die while admitted to the hospital.
Types of Hospital Mortality Rates
While there are several specific death rates (such as anesthesia death rate or maternal death rate), the two most common metrics calculated for the general hospital population are the Gross Mortality Rate and the Net Mortality Rate.
1. Gross Mortality Rate
The Gross Mortality Rate represents the proportion of all inpatient deaths compared to the total number of discharges (which includes both live discharges and deaths) over a specific period. It is the broadest measure of mortality within a facility.
Formula:
(Total Number of Inpatient Deaths / Total Number of Discharges) × 100
2. Net Mortality Rate (Institutional Death Rate)
The Net Mortality Rate is often considered a more accurate reflection of the hospital's quality of care. It adjusts the calculation by removing deaths that occurred within the first 48 hours of admission. The logic is that deaths occurring immediately after admission are often due to the severity of the condition upon arrival, rather than the care provided by the hospital.
Tracking these rates helps hospital administrators understand patient outcomes. A high Gross Mortality Rate might indicate a patient population with high acuity (very sick patients). However, if the Net Mortality Rate is significantly lower, it suggests that many deaths are happening immediately upon arrival (trauma, emergency), and the hospital is effectively stabilizing patients who survive that initial critical window.