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Table 3 Characteristics of the added dead-space test for predicting the outcome of extubation, considering clinical signs of respiratory insufficiency

From: A pilot study of a new test to predict extubation failure

 

Extubation failure

Successful extubation

Total

  

   Increased work of breathing (failed dead-space test)

9

3

12

Positive predictive value

75.0%

   No increase in work of breathing (not failed dead-space test)

13

127

140

Negative predictive value

90.7%

 

22

130

152

  
 

Sensitivity

Specificity

   
 

40.9%

97.7%

   

Likelihood ratio for a positive test

17.8

   
  1. Sensitivity represents the proportion of true positive tests, which is the proportion of patients with increased work of breathing in whom extubation failed.