Results of respiratory muscle function tests for patient and control groups
| UDP | Control | p-value | |
| Tw Pdi, bilateral | 17.3±5.0 | 26.2±5.5 | 0.001 |
| Tw Pdi, weak side | 3.3±1.7 | 10.4±1.9# | <0.001 |
| Tw Pdi, strong side | 11.2±2.2 | 13.4±3.3¶ | 0.083 |
| Sniff Pdi | 71.0±40.2 | 136.7±39.9 | 0.001 |
| Sniff Poes | 63.6±34.5 | 112.7±39.5 | 0.006 |
| Sniff Pnasal | 56.2±31.3 | 99.6±43.6 | 0.014 |
| PI,max | 49.4±29.8 | 110.0±43.7 | 0.001 |
| PE,max | 96.8±33.7 | 118.4±50.9 | 0.253 |
| Cough Pgas | 186.1±50.8 | 202.7±63.2 | 0.504 |
| Tw T10 | 43.7±33.5+ | 35.3±11.0 | 0.444 |
Data are presented as mean±sd cmH2O, unless otherwise stated. UDP: unilateral diaphragm paralysis or severe weakness; Tw: twitch; Pdi: transdiaphragmatic pressure; Poes: oesophageal pressure; Pnasal: nasal pressure; PI,max: maximal inspiratory pressure; PE,max: maximal expiratory pressure; Pgas: gastric pressure; T10: Pgas following magnetic stimulation at the level of the 10th thoracic segment. All twitches were elicited with magnetic stimulation. #: normal subjects with normal hemidiaphragm strength measured on the less strong side; ¶: normal subjects with normal hemidiaphragm strength measured on the stronger side; +: not available in four patients. 1 cmH2O = 0.1 kPa.