Table 2.
Prevalence and predictive values of questions for diagnosing asthma by GINA
| Question | Prevalence (%) | Sensitivity (%) | Specificity (%) | PPV* (%) | NPV †(%) |
|---|---|---|---|---|---|
| Q1. Wheezing | 38 | 50.8 | 65.8 | 28.1 | 83.6 |
| Q2. Exercise-induced dyspnea | 53 | 70.2 | 49.1 | 26.7 | 86.2 |
| Q3. Nocturnal cough/dyspnea | 47 | 62.1 | 44.8 | 22.8 | 81.8 |
| Q4. URI‡ ≥10 days | 49 | 64.5 | 42.2 | 22.7 | 81.8 |
| Q5. Pollution-induced dyspnea | 50 | 66.1 | 39.7 | 22.4 | 81.7 |
Abbreviations: * PPV positive predictive value, † NPV negative predictive value. ‡ URI upper respiratory tract infection.