six_minute_walk_prediction: 6-Minute Walk Distance (6MWD) Reference Equations

In cliot: Clinical Indices and Outcomes Tools

6-Minute Walk Distance (6MWD) Reference Equations

Description

Calculates the predicted 6-Minute Walk Distance (6MWD) and the Lower Limit of Normal (LLN) for healthy adults based on the reference equations by Enright and Sherrill (1998). If the patient's actual walked distance is provided, it calculates the percent predicted and evaluates if the performance is below the LLN.

Usage

six_minute_walk_prediction(sex, age, height_cm, weight_kg, actual_distance_m = NULL)

Arguments

sex	String. Patient sex ("Male" or "Female").
age	Numeric. Patient age in years (Range 40-80 years in validation study, but applicable to adults).
height_cm	Numeric. Patient height in centimeters.
weight_kg	Numeric. Patient weight in kilograms.
actual_distance_m	Numeric (Optional). The actual distance walked by the patient in meters. If provided, the function returns % Predicted and an interpretation relative to the LLN.

Value

A list containing:

Predicted_Distance_m	The estimated distance a healthy individual of the same demographics should walk.
Lower_Limit_Normal_m	The threshold below which the distance is considered abnormal (5th percentile).
Percent_Predicted	Ratio of Actual to Predicted distance (if actual is provided).
Interpretation	"Below Lower Limit of Normal" or "Normal" (if actual is provided).

References

Enright PL, Sherrill DL. Reference equations for the six-minute walk in healthy adults. Am J Respir Crit Care Med. 1998;158(5 Pt 1):1384-1387. doi:10.1164/ajrccm.158.5.9710086

Examples

# Example 1: Prediction only
# 65yo Male, 175cm, 80kg
six_minute_walk_prediction("male", 65, 175, 80)

# Example 2: With Actual Distance
# 60yo Female, 160cm, 70kg, walked 400 meters
six_minute_walk_prediction("female", 60, 160, 70, actual_distance_m = 400)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.