151106aa8e
Local-first Flutter app that identifies the single behavioral change most likely to extend lifespan using hazard-based modeling. Features: - Risk engine with hazard ratios from meta-analyses - 50 countries mapped to 4 mortality groups - 6 modifiable factors: smoking, alcohol, sleep, activity, driving, work hours - SQLite local storage (no cloud, no accounts) - Muted clinical UI theme - 23 unit tests for risk engine Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
131 lines
4.4 KiB
Dart
131 lines
4.4 KiB
Dart
import '../models/models.dart';
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/// Simplified mortality groups with approximate life expectancy at birth.
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/// Data approximated from WHO 2024 estimates.
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enum MortalityGroup {
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groupA, // High LE countries (~83-85)
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groupB, // Upper-middle LE (~79-81)
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groupC, // Middle LE (~72-76)
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groupD, // Lower LE (~65-70)
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}
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/// Maps countries to their mortality group.
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MortalityGroup getCountryGroup(String country) {
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return _countryToGroup[country] ?? MortalityGroup.groupB;
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}
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/// Get baseline life expectancy at birth for a given country group and sex.
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double getLifeExpectancyAtBirth(MortalityGroup group, Sex sex) {
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final base = _groupBaseLE[group]!;
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// Women live ~4-5 years longer on average
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return sex == Sex.female ? base + 4.5 : base;
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}
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/// Get remaining life expectancy at current age.
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/// Simplified model: as you age, remaining LE decreases but survivors
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/// tend to live longer than birth LE suggests.
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double getRemainingLifeExpectancy(int currentAge, Sex sex, String country) {
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final group = getCountryGroup(country);
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final leAtBirth = getLifeExpectancyAtBirth(group, sex);
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if (currentAge >= leAtBirth) {
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// Past average LE - use simplified survival model
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// Each year survived past LE adds ~0.5-0.8 expected years
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return 5.0 + (leAtBirth - currentAge) * 0.1;
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}
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// Simplified remaining LE calculation
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// People who survive to age X have higher LE than birth cohort suggests
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final survivorBonus = currentAge * 0.15; // ~0.15 years bonus per year survived
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final rawRemaining = leAtBirth - currentAge;
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return rawRemaining + survivorBonus.clamp(0, 5);
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}
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/// Base life expectancy by mortality group (male baseline).
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const _groupBaseLE = {
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MortalityGroup.groupA: 81.0,
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MortalityGroup.groupB: 77.0,
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MortalityGroup.groupC: 72.0,
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MortalityGroup.groupD: 65.0,
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};
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/// Country to mortality group mapping.
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const _countryToGroup = {
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// Group A - High LE (83-85)
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'Japan': MortalityGroup.groupA,
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'Switzerland': MortalityGroup.groupA,
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'Singapore': MortalityGroup.groupA,
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'Spain': MortalityGroup.groupA,
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'Italy': MortalityGroup.groupA,
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'Australia': MortalityGroup.groupA,
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'Iceland': MortalityGroup.groupA,
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'Israel': MortalityGroup.groupA,
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'Sweden': MortalityGroup.groupA,
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'France': MortalityGroup.groupA,
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'South Korea': MortalityGroup.groupA,
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'Norway': MortalityGroup.groupA,
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// Group B - Upper-middle LE (79-81)
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'United States': MortalityGroup.groupB,
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'United Kingdom': MortalityGroup.groupB,
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'Germany': MortalityGroup.groupB,
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'Canada': MortalityGroup.groupB,
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'Netherlands': MortalityGroup.groupB,
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'Belgium': MortalityGroup.groupB,
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'Austria': MortalityGroup.groupB,
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'Finland': MortalityGroup.groupB,
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'Ireland': MortalityGroup.groupB,
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'New Zealand': MortalityGroup.groupB,
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'Denmark': MortalityGroup.groupB,
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'Portugal': MortalityGroup.groupB,
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'Czech Republic': MortalityGroup.groupB,
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'Poland': MortalityGroup.groupB,
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'Chile': MortalityGroup.groupB,
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'Costa Rica': MortalityGroup.groupB,
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'Cuba': MortalityGroup.groupB,
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'United Arab Emirates': MortalityGroup.groupB,
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'Qatar': MortalityGroup.groupB,
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'Taiwan': MortalityGroup.groupB,
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// Group C - Middle LE (72-76)
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'China': MortalityGroup.groupC,
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'Brazil': MortalityGroup.groupC,
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'Mexico': MortalityGroup.groupC,
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'Russia': MortalityGroup.groupC,
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'Turkey': MortalityGroup.groupC,
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'Argentina': MortalityGroup.groupC,
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'Colombia': MortalityGroup.groupC,
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'Thailand': MortalityGroup.groupC,
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'Vietnam': MortalityGroup.groupC,
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'Malaysia': MortalityGroup.groupC,
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'Iran': MortalityGroup.groupC,
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'Saudi Arabia': MortalityGroup.groupC,
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'Egypt': MortalityGroup.groupC,
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'Ukraine': MortalityGroup.groupC,
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'Romania': MortalityGroup.groupC,
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'Hungary': MortalityGroup.groupC,
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'Peru': MortalityGroup.groupC,
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'Philippines': MortalityGroup.groupC,
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// Group D - Lower LE (65-70)
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'India': MortalityGroup.groupD,
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'Indonesia': MortalityGroup.groupD,
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'South Africa': MortalityGroup.groupD,
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'Pakistan': MortalityGroup.groupD,
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'Bangladesh': MortalityGroup.groupD,
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'Nigeria': MortalityGroup.groupD,
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'Kenya': MortalityGroup.groupD,
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'Ghana': MortalityGroup.groupD,
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'Ethiopia': MortalityGroup.groupD,
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'Myanmar': MortalityGroup.groupD,
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'Nepal': MortalityGroup.groupD,
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'Cambodia': MortalityGroup.groupD,
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};
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/// Get list of all supported countries, sorted alphabetically.
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List<String> getSupportedCountries() {
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final countries = _countryToGroup.keys.toList();
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countries.sort();
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return countries;
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}
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