/**
 * GeraClinic health calculators — pure, non-diagnostic reference math.
 *
 * These mirror GeraClinic's published health-tools library
 * (apps/gera-clinic-web/src/lib/health-tools/calc.ts) exactly: same formulas,
 * same WHO/NIH/ACC-AHA/ADAG reference ranges. Every function returns an
 * OBJECTIVE number plus, where applicable, a public reference CATEGORY label.
 * Nothing here diagnoses a condition or prescribes a dose — orientation only.
 */
export declare const LB_PER_KG = 2.2046226218;
export declare const CM_PER_INCH = 2.54;
export declare function cmToIn(cm: number): number;
export type BmiCategory = 'Underweight' | 'Healthy weight' | 'Overweight' | 'Obesity';
export declare function bmiCategory(value: number): BmiCategory;
export declare function bmi(weightKg: number, heightCm: number): {
    bmi: number;
    category: BmiCategory;
    healthyWeightRangeKg: {
        minKg: number;
        maxKg: number;
    };
    reference: string;
};
export declare function healthyWeightRangeKg(heightCm: number): {
    minKg: number;
    maxKg: number;
};
export type Sex = 'male' | 'female';
export type ActivityLevel = 'sedentary' | 'light' | 'moderate' | 'active' | 'very_active';
export declare const ACTIVITY_FACTORS: Record<ActivityLevel, number>;
export declare function bmrValue(weightKg: number, heightCm: number, ageYears: number, sex: Sex): number;
export declare function bmrTdee(weightKg: number, heightCm: number, ageYears: number, sex: Sex, activity: ActivityLevel): {
    bmrKcalPerDay: number;
    tdeeKcalPerDay: number;
    activityFactor: number;
    reference: string;
};
export declare function idealWeightKg(heightCm: number, sex: Sex): {
    reference: string;
    devineKg: number;
    robinsonKg: number;
    millerKg: number;
    hamwiKg: number;
};
export type BpCategory = 'Normal' | 'Elevated' | 'Hypertension stage 1' | 'Hypertension stage 2' | 'Hypertensive crisis';
export declare function bloodPressureCategory(systolic: number, diastolic: number): {
    systolic: number;
    diastolic: number;
    category: BpCategory;
    reference: string;
};
export declare function heartRateZones(ageYears: number): {
    estimatedMaxHr: number;
    zones: {
        description: string;
        lowBpm: number;
        highBpm: number;
        name: string;
    }[];
    reference: string;
};
export declare const MGDL_PER_MMOL = 18.0182;
export declare function a1c(a1cPercent?: number, avgGlucoseMgDl?: number): {
    a1cPercent: number;
    estAvgGlucoseMgDl: number;
    estAvgGlucoseMmolL: number;
    reference: string;
    avgGlucoseMgDl?: undefined;
    estA1cPercent?: undefined;
    avgGlucoseMmolL?: undefined;
    error?: undefined;
} | {
    avgGlucoseMgDl: number;
    estA1cPercent: number;
    avgGlucoseMmolL: number;
    reference: string;
    a1cPercent?: undefined;
    estAvgGlucoseMgDl?: undefined;
    estAvgGlucoseMmolL?: undefined;
    error?: undefined;
} | {
    error: string;
    a1cPercent?: undefined;
    estAvgGlucoseMgDl?: undefined;
    estAvgGlucoseMmolL?: undefined;
    reference?: undefined;
    avgGlucoseMgDl?: undefined;
    estA1cPercent?: undefined;
    avgGlucoseMmolL?: undefined;
};
export declare function waterIntakeLitres(weightKg: number, activityMinutes?: number): {
    litresPerDay: number;
    reference: string;
};
export type WaistHeightCategory = 'Low' | 'Healthy' | 'Increased' | 'High';
export declare function waistToHeight(waistCm: number, heightCm: number): {
    ratio: number;
    category: WaistHeightCategory;
    reference: string;
};
export interface CalculatorInfo {
    id: string;
    title: string;
    description: string;
    inputs: string[];
    reference: string;
}
export declare const CALCULATORS: CalculatorInfo[];