LLN_JRS {rspiro}

Calculate LLN of spirometry parameters using JRS (2014) equations

Description

This function calculates LLNs (Lower Limits of Normal) for the various spirometry parameters, using the JRS (Japanese Respiratory Society 2014) equations. It accepts as input age, height, gender.

Usage

LLN_JRS(age, height, gender = 1, param = "FEV1")

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.

param

A character vector, containing one of more of the following parameters (case insensitive): "FEV1", "FVC", "VC", "FEV1FVC"

Details

Arguments age, height and gender are vectors of equal length, or of length one, in which case the value is recycled; if the four vectors are not of equal length, the function stops with an error.

Value

If param has length one, the function returns a numeric vector. If param has length >1, it returns a data.frame with length(param) columns.

Examples

# Find LLN of FEV1 and FVC for Japanese women aged 20 to 70 and with a height of 1.70 meters.
LLN_JRS(20:70, 1.7, 2, param=c("FEV1","FVC"))