>70 yr	18–70 yr
Number of patients	100	250
IPAH : HPAH : ArPAH, %	88 : 0 : 12	81:7:12
Sex ratio F/M	1	1.29
Age, yr	76±3	51±14
NYHA FC, I-II : III : IV, %	16 : 63 : 21	24 : 62 : 14
6-min walk distance, m	242±108	349±119
Right atrial pressure, mmHg	8±5	9±6
Pulmonary artery mean pressure, mmHg	44±9	52±13
Pulmonary capillary wedge pressure, mmHg	9±4	9±4
Cardiac index, L/min/m2	2.4±0.6	2.4±0.8
Pulmonary vascular resistance, d·s·cm–5	716±276	904±498