Table 3– Correlations between 6-min walk distance and other continuous variables at baseline

Covariates	r	p-value
Age years	−0.317	0.018
Rest
Heart rate beats·min⁻¹	−0.058	0.678
RAP mmHg	−0.197	0.150
Mean PAP mmHg	−0.089	0.519
Cardiac index L·min⁻¹·m⁻²	0.239	0.079
PVR dyn·s·cm⁻⁵	−0.189	0.166
Exercise
Heart rate beats·min⁻¹	0.164	0.293
RAP mmHg	−0.145	0.289
Mean PAP mmHg	0.162	0.237
Cardiac index L·min⁻¹·m⁻²	0.414	0.002
Change from rest to exercise of cardiac index L·min⁻¹·m⁻²	0.481	<0.001
PVR dyn·s·cm⁻⁵	−0.329	0.020

RAP: right atrial pressure; PAP: pulmonary artery pressure; PVR: pulmonary vascular resistance.