/// <summary>
/// Calculates the z-score for a growth measure using a specified value.
/// </summary>
/// <param name="indicator">The growth indicator</param>
/// <param name="measurement">The specified measured value</param>
/// <param name="ageInDays">The age in total days</param>
/// <param name="sex">Human sex designation per ISO/IEC 5218 code</param>
/// <returns>Returns the z-score for a growth measure using a specified value.</returns>
public double CalculateZScore(Indicator indicator, double measurement, double ageInDays, Sex sex)
{
WHO2006 who2006 = new WHO2006();
double z = 0.0;
if (who2006.TryCalculateZScore(indicator, measurement, ageInDays, sex, z: ref z))
{
return(z);
}
return(z);
}
/// <summary>
/// Calculates both the Zscore and Percentile.
/// </summary>
/// <param name="indicator">The growth indicator</param>
/// <param name="measurement">The specified measured value</param>
/// <param name="ageInDays">The age in total days</param>
/// <param name="sex">Human sex designation per ISO/IEC 5218 code</param>
/// <returns>Returns the z-score and percentile for a growth measure using a specified value.</returns>
public Tuple <double, double> GetScore(Indicator indicator, double measurement, double ageInDays, Sex sex)
{
WHO2006 who2006 = new WHO2006();
double z = 0.0;
double p = 0.0;
if (who2006.TryCalculateZScore(indicator, measurement, ageInDays, sex, z: ref z))
{
p = StatisticsHelper.CalculatePercentile(z);
}
z = Math.Round(z, 2);
p = Math.Round(p, 1);
return(Tuple.Create(z, p));
}
static void Main(string[] args)
{
var cdc2000 = new CDC2000();
var who2006 = new WHO2006();
var who2007 = new WHO2007();
// Calculates a BMI-for-age z-score using CDC 2000
double ageMonths = 26;
double z = 0.0;
double bmi = 18.0;
if (cdc2000.TryCalculateZScore(indicator: Indicator.BodyMassIndexForAge, measurement1: bmi, measurement2: ageMonths, sex: Sex.Female, z: ref z))
{
double p = StatisticsHelper.CalculatePercentile(z);
z = Math.Round(z, 2);
p = Math.Round(p, 2);
Console.WriteLine($"[CDC 2000] - {ageMonths} month old female with BMI = {bmi} has z-score of {z} and percentile of {p}");
}
else
{
Console.WriteLine($"{ageMonths} is a valid age in months for the CDC 2000 BMI-for-age indicator.");
}
// Calculates a BMI-for-age z-score using WHO 2006
double ageDays = 32;
bmi = 16;
if (who2006.TryCalculateZScore(indicator: Indicator.BodyMassIndexForAge, measurement1: bmi, measurement2: ageDays, sex: Sex.Female, z: ref z))
{
double p = StatisticsHelper.CalculatePercentile(z);
z = Math.Round(z, 2);
p = Math.Round(p, 2);
Console.WriteLine($"[WHO 2006] - {ageDays} day old female with BMI = {bmi} has z-score of {z} and percentile of {p}");
}
else
{
Console.WriteLine($"{ageMonths} is a valid age in days for the WHO 2006 BMI-for-age indicator.");
}
// Calculates a BMI-for-age z-score using WHO 2007
ageMonths = 64;
bmi = 17;
if (who2007.TryCalculateZScore(indicator: Indicator.BodyMassIndexForAge, measurement: bmi, age: ageMonths, sex: Sex.Female, z: ref z))
{
double p = StatisticsHelper.CalculatePercentile(z);
z = Math.Round(z, 2);
p = Math.Round(p, 2);
Console.WriteLine($"[WHO 2007] - {ageMonths} month old male with BMI = {bmi} has z-score of {z} and percentile of {p}");
}
else
{
Console.WriteLine($"{ageMonths} is a valid age in months for the WHO 2007 BMI-for-age indicator.");
}
Console.WriteLine();
// If interested in performance tests, see below
TestCDC2000ComputeSpeed(true); // forces test to use interpolation of L, M, and S values (more computationally expensive)
TestCDC2000ComputeSpeed(false); // forces test to never use interpolation
Console.WriteLine();
TestWHO2006ComputeSpeed(); // WHO 2006 standard doesn't typically need interpolation since age is measured in days, and trying to interpolate LMS values between e.g. day 66 and 67 is not worthwhile
Console.WriteLine();
TestWHO2007ComputeSpeed(true); // forces test to use interpolation of L, M, and S values (more computationally expensive)
TestWHO2007ComputeSpeed(false); // forces test to never use interpolation
}
