face_scan_score_calculation

calculate_face_scan_wellness_index.js

const calculateWellnessIndex = (results: VitalResults): number => {
    let wellnessIndex = 0;

    const ranges: HealthRanges = {
        'Pulse Rate': { low: 60, normal: [60, 100], high: 100, monitor: 120 },
        'Blood Oxygen': { low: 95, normal: [95, 100], high: 100, monitor: 100 },
        'Blood Pressure': {
            systolic: { low: 90, normal: [90, 120], high: 120, monitor: 140 },
            diastolic: { low: 60, normal: [60, 80], high: 80, monitor: 90 }
        },
        'Respiration Rate': { low: 12, normal: [12, 20], high: 20, monitor: 24 },
        'SDNN': { low: 50, normal: [50, 100], high: 100, monitor: 30 },
        'RMSSD': { low: 20, normal: [20, 89], high: 107, monitor: 16 },
        'Mean RRI': { low: 650, normal: [650, 1200], high: 1200, monitor: 600 },
        'LF/HF Ratio': { low: 1, normal: [1, 2], high: 2, monitor: 3 },
        'PNS Index': { low: -2, normal: [-2, 2], high: 2, monitor: 2 },
        'SNS Index': { low: -5, normal: [-5, 5], high: 5, monitor: 5 },
        'Stress Level': { low: 1, normal: [1, 3], high: 4, monitor: 5 },
        'Stress Index': { low: 0, normal: [0, 150], high: 150, monitor: 200 },
        'Wellness Index': { low: 0, normal: [70, 100], high: 100, monitor: 100 }
    };

    const checkRange = (value: number, range: RangeConfig) => {
        return value >= range.normal[0] && value <= range.normal[1];
    };

    // Basic Vitals (Total: 40 points)
    if (checkRange(Number(results.pulseRate), ranges['Pulse Rate'])) wellnessIndex += 5;
    if (checkRange(Number(results.spo2), ranges['Blood Oxygen'])) wellnessIndex += 10;
    // Commenting out blood pressure check for App Store submission
    
    if (checkRange(Number(results.bloodPressure.systolic), ranges['Blood Pressure'].systolic) &&
        checkRange(Number(results.bloodPressure.diastolic), ranges['Blood Pressure'].diastolic)) wellnessIndex += 15;
    
    if (checkRange(Number(results.respirationRate), ranges['Respiration Rate'])) wellnessIndex += 10;

    // Commenting out HRV Metrics for App Store submission
    
    // HRV Metrics (Total: 25 points)
    if (checkRange(Number(results.sdnn), ranges['SDNN'])) wellnessIndex += 10;
    if (checkRange(Number(results.rmssd), ranges['RMSSD'])) wellnessIndex += 10;
    if (checkRange(Number(results.meanRRI), ranges['Mean RRI'])) wellnessIndex += 5;

    // ANS Metrics (Total: 30 points)
    if (checkRange(Number(results.lfhf), ranges['LF/HF Ratio'])) wellnessIndex += 10;
    if (checkRange(Number(results.pnsIndex), ranges['PNS Index'])) wellnessIndex += 10;
    if (checkRange(Number(results.snsIndex), ranges['SNS Index'])) wellnessIndex += 10;
    

    // Stress Level (5 points)
    if (checkRange(Number(results.stressLevel), ranges['Stress Level'])) wellnessIndex += 5;

    // Sum all possible points from each metric
    // Pulse Rate: 5, Blood Oxygen: 10, Blood Pressure: 15, Respiration Rate: 10
    // SDNN: 10, RMSSD: 10, Mean RRI: 5, LF/HF Ratio: 10, PNS Index: 10, SNS Index: 10, Stress Level: 5
    const maxPointsPossible = 100;
    // Scale back to 0-100 range
    wellnessIndex = (wellnessIndex / maxPointsPossible) * 100;

    // Ensure the score never exceeds 100
    return Math.min(100, Math.round(wellnessIndex));
};