Test results for pepsin in patients with chronic cough compared to healthy volunteers
| At least one sample positive | One sample positive | Two samples positive | All three samples positive | All three samples negative | Pepsin level >250 ng/ml | |
|---|---|---|---|---|---|---|
| Chronic cough patients | 63.9% | 33.3% | 13.9% | 16.7% | 36.1% | 4.6% |
| Healthy volunteers | 36% | 20% | 12% | 4% | 64% | 2% |