Table 3. Predicting model for walk distance (6MWD, n = 5614).

	Regressors	Standard Error	p-value	95% CI
R2 = 0.37
RMSE = 64.17 m
p<0.0001
Age	93.35	7.61	p<0.0001	78.43	108.27
Age2	-4.05	0.44	P<0.0001	-4.93	-3.18
Gender (males vs females)	7.34	1.72	p<0.0001	3.98	10.71
Weight (kg)	-2.12	0.17	p<0.0001	-2.45	-1.78
Height (cm)	2.50	0.19	p<0.0001	2.12	2.88