CVD_Calc

This project is designed to investigate the CVD index of a person, and is more parametized with weather condition.
This App is written in C# and xamarin forms, so both android and ios platform are supported.
This app includes the following functions:
1. CVD calculator
2. Interval Timer
3. Weather forecast and
4. showing previous records.

CVD calculator

The calculator runs everyday in the morning to calculate your CVD index, taking weather conditon into account.
Thus, the app may send you some reminder(溫提) so that you can take a look and mind your health.

Interval Timer

You could consider it as a countdown timer, but once you have set the rest time and the work time,
the timer countdown the two times repeatedly, so when time is up, you could either return to work,
or take a rest. Note that it is not recommended to quit the app when the timer is running.

Weather forecast

Since weather condition is now also taken into account, the app shows you the temperature and humidity of the next 5 days.

Previous records

Here, you can check the CVD index, weather conditions, concentrations of pollutants in the past.

References

Here shows part of the calculations.

Notes

This is the code for calculating the cvd.

 private double calcvd(DB_pdata c, double tem, List<AirQuality> aq,bool ishol)
        {
            DateTime td = DateTime.Today;
            Func<int, int> f = x => (x < 0) ? -1 : 0;

            double age = (DateTime.Today.Year - c.dob.Year);
            if (td.Month < c.dob.Month || td.Day < c.dob.Day) age--;

            double height = c.heig;
            double weight = c.weig;
            bool gender = c.genD;
            double SP = c.Sbp;
            double DP = c.Dbp;
            double CL = c.Cho;
            double BH = c.hdll;
            bool is_smoker = c.smoK;
            bool is_diabetic = c.diaB;

            double temp = tem;
            double frs = 0;
            double pm_2_5 = getwmean((std(aq[0].HE_PM2_5) + std(aq[1].HE_PM2_5)) / 2,
                (std(aq[2].HE_PM2_5) + std(aq[3].HE_PM2_5)) / 2,
                (std(aq[4].HE_PM2_5) + std(aq[5].HE_PM2_5)) / 2);
            double pm_10 = getwmean((std(aq[0].HE_PM10) + std(aq[1].HE_PM10)) / 2,
                (std(aq[2].HE_PM10) + std(aq[3].HE_PM10)) / 2,
                (std(aq[4].HE_PM10) + std(aq[5].HE_PM10)) / 2);
            double so2 = getwmean((std(aq[0].HE_SO2) + std(aq[1].HE_SO2)) / 2,
                (std(aq[2].HE_SO2) + std(aq[3].HE_SO2)) / 2,
                (std(aq[4].HE_SO2) + std(aq[5].HE_SO2)) / 2);
            double no2 = getwmean((std(aq[0].HE_NO2) + std(aq[1].HE_NO2)) / 2,
                (std(aq[2].HE_NO2) + std(aq[3].HE_NO2)) / 2,
                (std(aq[4].HE_NO2) + std(aq[5].HE_NO2)) / 2);
            //age factor=====================================
            if (age >= 30 && age < 35) frs--;
            else if (age >= 40 && age < 45) frs++;
            else if (age >= 45 && age < 50) frs += 2;
            else if (age >= 50 && age < 55) frs += 3;
            else if (age >= 55 && age < 60) frs += 4;
            else if (age >= 60 && age < 65) frs += 5;
            else if (age >= 65 && age < 70) frs += 6;
            else if (age >= 70 && age < 75) frs += 7;
            //cholesterol level===============================
            if (CL < 160) frs -= 3;
            else if (CL >= 160 && CL < 200) frs += 0;
            else if (CL >= 200 && CL < 240) frs++;
            else if (CL >= 240 && CL < 280) frs += 2;
            else frs += 3;
            //blood HDL=======================================
            if (BH < 35) frs += 2;
            else if (BH >= 35 && BH < 45) frs++;
            else if (BH >= 45 && BH < 60) frs += 0;
            else frs -= 2;
            //blood pressure==================================
            if (SP >= 160 || DP >= 100) frs += 3;
            else if (SP >= 140 || DP >= 90) frs += 2;
            else if (SP >= 130 || DP >= 85) frs++;
            //else frs += 0;
            //is_diabetic=====================================
            if (is_diabetic) frs += 2;
            //is_smoker=======================================
            if (is_smoker) frs += 2;
            //convert to probability
            if (frs <= -3) frs = 0.01;
            else if (frs == -2) frs = 0.02;
            else if (frs == -1) frs = 0.02;
            else if (frs == 0) frs = 0.03;
            else if (frs == 1) frs = 0.04;
            else if (frs == 2) frs = 0.04;
            else if (frs == 3) frs = 0.06;
            else if (frs == 4) frs = 0.07;
            else if (frs == 5) frs = 0.09;
            else if (frs == 6) frs = 0.11;
            else if (frs == 7) frs = 0.14;
            else if (frs == 8) frs = 0.18;
            else if (frs == 9) frs = 0.22;
            else if (frs == 10) frs = 0.27;
            else if (frs == 11) frs = 0.33;
            else if (frs == 12) frs = 0.4;
            else if (frs == 13) frs = 0.47;
            else if (frs == 14) frs = 0.56;

            //temperature=====================================
            if (temp > 26) frs *= Math.Pow(1.17, (temp - 26));
            else if (temp < 26) frs *= Math.Pow(1.12, (-temp + 26));
            //air quality=====================================
            if (pm_2_5 > 96.2) frs *= Math.Pow(1.27, (pm_2_5 - 96.2) / 10);
            if (pm_10 > 115.6 && age >= 65) frs *= Math.Pow(1.012, (pm_10 - 115.6) / 10);
            if (so2 >= 53.21) frs *= Math.Pow(1.01, (so2 - 53.21)/10);
            if (no2 >= 53.08) frs *= Math.Pow(1.019, (no2 - 53.08)/10);

            //holiday factor
            if (ishol) frs *= 2.375;
            return frs;
        }