| Age group | Helicobacter pylori | |||
| Positive | Negative | % | ||
| Group A (6 months - 5 years) | (n = 448) | 40 | 408 | 8.9 |
| Group B (6 - 10 years) | (n = 653) | 38 | 615 | 5.8 |
| Group C (11 - 15 years) | (n = 340) | 18 | 322 | 5.2 |