Understanding miscarriage rates can be a sensitive but important topic for many individuals. A miscarriage is defined as the spontaneous loss of a pregnancy before the 20th week of gestation. Various factors can influence the likelihood of a miscarriage, including maternal age, previous pregnancy history, and certain lifestyle choices.
This calculator is designed to provide an estimated miscarriage rate based on commonly cited statistical data. It's important to remember that these are general statistics and do not predict individual outcomes. For personalized medical advice, please consult with a healthcare professional.
function calculateMiscarriageRate() {
var gestationalAge = parseFloat(document.getElementById("gestationalAge").value);
var previousMiscarriages = parseFloat(document.getElementById("previousMiscarriages").value);
var liveBirths = parseFloat(document.getElementById("liveBirths").value);
var maternalAge = parseFloat(document.getElementById("maternalAge").value);
var resultElement = document.getElementById("result");
resultElement.innerHTML = ""; // Clear previous results
if (isNaN(gestationalAge) || isNaN(previousMiscarriages) || isNaN(liveBirths) || isNaN(maternalAge)) {
resultElement.innerHTML = "Please enter valid numbers for all fields.";
return;
}
// Basic model incorporating some common risk factors. This is a simplified representation.
// Actual miscarriage risk is complex and influenced by many more factors.
var baseRate = 0.10; // General baseline miscarriage rate for early pregnancy
// Age factor: Rate increases with maternal age
var ageFactor = 0;
if (maternalAge > 30) {
ageFactor = (maternalAge – 30) * 0.015;
} else if (maternalAge > 35) {
ageFactor = 0.075 + (maternalAge – 35) * 0.025;
}
// History factor: Previous miscarriages increase risk
var historyFactor = 0;
if (previousMiscarriages > 0) {
historyFactor = previousMiscarriages * 0.05; // Each previous miscarriage adds to risk
}
// Gestational age factor: Risk generally decreases as pregnancy progresses
// This model simplifies and assumes risk is highest early on, but we'll use it as a slight modifier
var gestationalFactor = 0;
if (gestationalAge > 10) {
gestationalFactor = -0.02; // Slightly lower risk as pregnancy advances
}
var estimatedRate = baseRate + ageFactor + historyFactor + gestationalFactor;
// Ensure the rate is within a reasonable range (e.g., 0% to 100%)
estimatedRate = Math.max(0, Math.min(1, estimatedRate));
resultElement.innerHTML = "Estimated Miscarriage Rate: " + (estimatedRate * 100).toFixed(2) + "%";
resultElement.innerHTML += "This is a simplified model based on general statistics. Individual risk can vary significantly.";
}