Pulmonary function in 11 male patients with idiopathic pulmonary arterial hypertension(IPAH) and 25 controls
| IPAH | Controls | p-value | |
| Subjects n | 11 | 25 | |
| Age yrs | 47.6±20.1 | 47.0±13.6 | ns |
| Height cm | 175.4±7.9 | 179.5±5.0 | ns |
| Body mass index kg·m−2 | 26.8±6.0 | 27.7±3.8 | ns |
| Body surface area m2 | 1.9±0.3 | 2.0±0.2 | ns |
| VC % pred | 85.4±10.6 | 101.9±9.5 | <0.01 |
| FEV1 % pred | 82.7±10.6 | 107.3±14.3 | <0.01 |
| (FEV1/VC)×100 | 75.1±8.2 | 81.9±6.5 | <0.05 |
| MEF50 % pred | 60.8±18.8 | 106.8±29.3 | <0.01 |
| Rtot kPa·s−1·L−1 | 0.24±0.10 | 0.24±0.08 | ns |
Data are presented as n and mean±sd. VC: vital capacity; % pred: % predicted; FEV1: forced expiratory volume in one second; MEF50: maximal expiratory flow at 50% of expired VC, Rtot: total airway resistance; ns: nonsignificant (t-test).