Table 4. Correlation coefficients between resting CI and key exercise variables obtained during CPET, NYHA-FC and 6MWT in patients with Sch-PAH and IPAH.

	Sch-PAH	IPAH
NYHA-FC	−0.85*	−0.74*
6MWD, m	−0.03	0.25
VO2 peak, % predicted	0.51	0.72*
ΔVO2/ΔWR	0.61	0.58*
ΔVE/ΔVCO2	0.08	−0.60*

^*p<0.05;

Definition of Abbreviations: NYHA-FC, New York Heart Association functional class; VO₂, oxygen uptake; WR, work rate; VE, minute ventilation; VCO₂, carbon dioxide uptake.