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Seven year follow up of subjects who were negative for Helicobacter pylori at first testing
| Group | H pylori positive | H pylori negative | Total |
|---|---|---|---|
| Control subjects | 1 | 102 | 103 |
| Gastroenterologists* | 7 | 47 | 54 |
Pearson χ2: P=0.012 (two tailed); Fisher's exact test: P=0.025 (two tailed) compared with controls.
