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Table 3 2 × 2 table of spirometry for diagnosing airway obstruction in patients with COPD (n = 208; asthma patients with FEV1 <80% of predicted in general practice and in lung function laboratory excluded)

From: Diagnostic accuracy of spirometry in primary care

  COPD No COPD  
Spirometry + 44 26  
Spirometry - 4 134  
    208
Pretest probability of having COPD 23%
Pretest probability of not having COPD 77%
Sensitivity 92% (95%CI 80–97)
Specificity 84% (95%CI 77–89)
PPV 63% (95%CI 51–73)
NPV 97% (95%CI 93–99)