Table 2. Correlations between OUE and key abnormal parameters for IPAH patients (N = 32).

	OUEP %pred	OUES %pred
NYHA	−0.724**	0.125
mPAP, mm Hg	−0.338	−0.351
TPVR, mm Hg/L/min	−0.694**	−0.015
CI, L/min/m2	0.295	0.047
DLco, ml/mm Hg/min	0.577*	0.493
PeakV˙O2, (%pred)	0.460	0.009
Peak PETCO2, mm Hg	0.680**	0.179
Lowest V˙E/V˙CO2 (%pred)	−0.902**	−0.136

*P<0.05, **P<0.005.

The abbreviation definitions are same as Table 1.