Prevalence (%) of reflux oesophagitis and gastric cancer in subjects aged <50 or ⩾50 years old
| Group | A | B | C | D |
| H pylori antibody | − | + | + | - |
| Pepsinogen | Normal | Normal | Low | Low |
| Reflux oesophagitis | ||||
| <50 y | 2.3 | 1.9 | 1.3 | 0 |
| ⩾50 y | 2.9 | 1.5 | 1.0 | 0 |
| Gastric cancer | ||||
| <50 y | 0 | 0 | 0.8 | 1.6 |
| ⩾50 y | 0.2 | 1.1 | 1.2 | 2.4 |