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Effect of symptom assemblages on the predicted percentage of H pylori infection.
| Symptom | H pylori infection | Predicted percentage |
| Digestion related | Negative | 17.6 |
| Positive | 95.5 | |
| Overall | 73.8 | |
| Non-digestion related | Negative | 41.2 |
| Positive | 93.2 | |
| Overall | 78.7 |
