Symptom analysis using symptom index (SI) and symptom association probability (SAP) for each symptom
| Symptom type | No of patients | Positive SAP | Negative SAP | Positive SI | Negative SI | Positive SI for acid | Positive SI for non-acid |
|---|---|---|---|---|---|---|---|
| Chest pain | 49 | 9 | 40 | 17 | 32 | 3 | 14 |
| Regurgitation | 65 | 34 | 31 | 32 | 33 | 7 | 25 |
| Heartburn | 57 | 17 | 40 | 22 | 35 | 9 | 13 |
| Belching | 4 | 2 | 2 | 1 | 3 | 0 | 1 |
| Cough | 48 | 11 | 37 | 9 | 39 | 0 | 9 |
| Globus | 4 | 0 | 4 | 1 | 3 | 0 | 1 |
| Hiccups | 1 | 0 | 1 | 1 | 0 | 0 | 1 |
| Hoarseness | 6 | 1 | 5 | 2 | 4 | 0 | 2 |
| Mucous | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| Nausea | 13 | 3 | 10 | 1 | 12 | 1 | 0 |
| Sour taste | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
| Throat discomfort | 28 | 8 | 20 | 6 | 22 | 2 | 4 |
| Wheezing | 8 | 1 | 7 | 3 | 5 | 1 | 2 |
| Abdominal discomfort | 17 | 5 | 12 | 6 | 11 | 1 | 5 |