Table 3.
Accuracy of peak flow meter with and without symptoms for detection of OAD and detection of asthma and COPD
| Sensitivity, % | Specificity, % | Positive Predictive Value, % | Negative Predictive Value, % | |
|---|---|---|---|---|
| Peak flow meter (PEF < 80% predicted) for detection of OAD | 89 | 68 | 91 | 62 |
| Peak flow meter and symptoms for detection of OAD (breathlessness and/or cough > 6 months) | 84 | 93 | 98 | 62 |
| Peak flow meter and symptoms for detection of asthma (breathlessness and/or cough > 6 months + presence of asymptomatic period) | 77 | 93 | 95 | 73 |
| Peak flow meter and symptoms for detection of COPD (breathlessness and/or cough > 6 months + absence of asymptomatic period) | 79 | 95 | 76 | 95 |
| 2-step model | 97 | 82 | 95 | 90 |