Table 4.

Stepwise multiple linear regression analysis by sex for factors associated with the 6MWD

	Female			Male
	Unstandardized Coefficient	SE	p-value	Unstandardized Coefficient	SE	p-value
Constant	−0.458	94.924		−11.394	93.543
Height, cm	3.494	0.595	<0.001	3.659	0.545	<0.001
Difference in HR	1.113	0.142	<0.001	0.692	0.129	<0.001
R square	0.394			0.326
Change in R square	0.387			0.318

Both height and the difference in heart rate before and after the walk test were significantly associated with 6MWD

The reference equations of the 6MWD are as follows:

Female: 6MWD (m) = − 0.458 + (difference in heart rate × 1.113) + [height (cm) × 3.494]; r² = 0.387

Male: 6MWD (m) = −11.394 + (difference in heart rate × 0.692) + [height (cm) × 3.659]; r² = 0.318