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Annals of Intensive Care
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Table 2 Correlations between physiological parameters before and after extubation

From: Physiological predictors of respiratory and cough assistance needs after extubation

  VC
Before extubation 		FVC
Before extubation 		MIP
Before extubation 		MEP
Before extubation 		PEF
Before extubation 		PECF
Before extubation
VC
After extubation
 R 0.61      
 P value < 0.0001      
FVC
After extubation
 R   0.89     
 P value   < 0.0001     
MIP
After extubation
 R    0.70    
 P value    < 0.0001    
MEP
After extubation
 R     0.66   
 P value     < 0.0001   
PEF
After extubation
 R      0.60  
 P value      < 0.0001  
PCEF
After extubation
 R       0.58
 P value       < 0.0001
  1. For each parameter, the table shows the correlation coefficient and P value
  2. Italics indicate significant data
  3. VC vital capacity, FVC forced vital capacity, MIP maximal inspiratory pressure, MEP maximal expiratory pressure, PEF peak expiratory flow, PCEF peak cough expiratory flow
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