Pulmonary function test results
| UDP | Control | p-value | |
| FEV1 % pred | 62.5±16.6 | 99.0±13.1 | <0.001 |
| VC % pred | 74.4±18.4 | 102.3±22.8 | 0.005 |
| FEV1/VC ratio % | 71.3±10.5 | 80.8±5.2 | 0.014 |
| VC drop# % | 20.7±5.7¶ | 6.4±4.7 | <0.001 |
| Pa,O2 kPa | 10.08±1.19 | 12.10±1.42 | 0.002 |
| Pa,CO2 kPa | 4.92±0.33 | 5.07±0.45 | 0.389 |
Data are presented as mean±sd, unless otherwise stated. UDP: unilateral diaphragm paralysis or severe weakness; FEV1: forced expiratory volume in one second; % pred: % predicted; VC: vital capacity; Pa,O2: arterial oxygen tension; Pa,CO2: arterial carbon dioxide tension. #: fall in VC when changing from sitting to supine position; ¶: patient no. eight was excluded due to inability to perform the manoeuvre.