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Table 4 2 × 2 table of spirometry for diagnosing airway obstruction in patients with asthma in general practice (n = 168; patients with COPD excluded)

From: Diagnostic accuracy of spirometry in primary care

  asthma no asthma  
Spirometry + 26 8  
Spirometry - 63 71  
    168
Pretest probability of having asthma 41%
Pretest probability of not having asthma 59%
Sensitivity 29% (95%CI 21–39)
Specificity 90% (95%CI 81–95)
PPV 77% (95%CI 60–88)
NPV 53% (95%CI 45–61)