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/* calculate arterial hypertension severity */
var systolic = document.getElementById('systolic').value;
var diastolic = document.getElementById('diastolic').value;
var severity = document.getElementById('severity');
if (systolic < 120 && diastolic < 80) {
  severity.innerHTML = 'Normal';
} else if (systolic < 130 && diastolic < 80) {
  severity.innerHTML = 'Elevated';
} else if (systolic < 140 || diastolic < 90) {
  severity.innerHTML = 'Stage 1 Hypertension';
} else if (systolic < 180 || diastolic < 120) {
  severity.innerHTML = 'Stage 2 Hypertension';
} else {
  severity.innerHTML = 'Hypertensive Crisis';
}