Table 6 Cross-tabulation of each test measuring global inspiratory, diaphragm and expiratory strength
Sniff PnasalTotal
NormalLow
Group A: Inspiratory muscle tests
Pimax
    Normal9217109
    Low145973
Total10676182
Sniff Poes
NormalLowTotal
Pimax
    Normal9415109
    Low195473
Total11369182
Sniff Poes
NormalLowTotal
Sniff Pnasal
    Normal1015106
    Low126476
Total11369182
Group B: Diaphragm tests
Twitch Pdi
NormalLowTotal
Sniff Pdi
    Normal523284
    Low34146180
Total86178264
Group C: Expiratory muscle tests
Pemax
NormalLowTotal
Cough Pgas
    Normal31738
    Low61622
Total372360
Twitch T10
NormalLowTotal
Pemax
    Normal30737
    Low131023
Total431760
Twitch T10
NormalLowTotal
Cough Pgas
    Normal36238
    Low71522
Total431760
  • Pimax, maximum inspiratory pressure; Pnasal, nasal pressure; Poes, oesophageal pressure; Pdi, transdiaphragmatic pressure; Pemax, maximum expiratory pressure; Pgas, gastric pressure.