zscore_JRS: Convert spirometric values to z-scores using JRS (2014)...

In thlytras/rspiro: Implementation of Spirometry Equations

Convert spirometric values to z-scores using JRS (2014) equations

Description

This function takes absolute spirometry measurements (FEV1, FVC, VC, FEV1/FVC) in lt plus demographic data (age, height and gender) and converts them to z-scores based on the JRS (Japanese Respiratory Society 2014) equations.

Usage

zscore_JRS(
  age,
  height,
  gender = 1,
  FEV1 = NULL,
  FVC = NULL,
  VC = NULL,
  FEV1FVC = NULL
)

Arguments

age	Age in years
height	Height in meters
gender	Gender (1 = male, 2 = female) or a factor with two levels (first = male). Default is 1.
FEV1	Forced Expiratory Volume in 1 second (lt)
FVC	Forced Vital Capacity (lt)
VC	Vital Capacity (lt)
FEV1FVC	FEV1 / FVC

Details

At least one of the spirometric measurement arguments must be set (i.e. be non-NULL). Arguments age, height, and gender must be vectors of length equal to the length of the spirometric measurement vector(s), or of length one, in which case their value is recycled. If any input vector is not of equal length, the function stops with an error.

Value

If only one spirometry argument is supplied, the function returns a numeric vector. If more are supplied, the function returns a data.frame with the same number of columns.

Examples

# Random data, 4 patients, one parameter supplied (FEV1)
zscore_JRS(age=seq(25,40,4), height=c(1.8, 1.9, 1.75, 1.85),
      gender=c(2,1,2,1), FEV1=c(3.5, 4, 3.6, 3.9))

thlytras/rspiro documentation built on June 24, 2024, 7:58 a.m.