Skip to main content

Table 5 2 × 2 table of spirometry for diagnosing airway obstruction in patients with asthma in lung function laboratory (all patients included with differentiation between asthma and COPD)

From: Diagnostic accuracy of spirometry in primary care

  asthma no asthma  
Spirometry + 14 0  
Spirometry - 76 129  
    219
Pretest probability of having asthma 41%
Pretest probability of not having asthma 59%
Sensitivity 16% (95%CI 10–24)
Specificity 100% (95%CI 97–100)
PPV 100% (95%CI 79–100)
NPV 63% (95%CI 56–69)