Changes in the prevalence of gastric and oesophageal lesions before and after mass eradication of Helicobacter pylori infection
| Outcome variable | Before chemoprevention | After chemoprevention |
| Number of population | 1762 | 841 |
| Gastric atrophy | 1056 (59.9) | 115 (13.7) |
| Intestinal metaplasia | 558 (31.7) | 327 (38.9) |
| Indefinite for dysplasia | 142 (8.1) | 128 (15.2) |
| Low-grade dysplasia | 6 (0.3) | 17 (2.0) |
| High-grade dysplasia | 0 (0) | 0 (0) |
| Active peptic ulcer | 193 (11.0) | 30 (3.6) |
| Reflux oesophagitis | 241 (13.7) | 230 (27.3) |
| Los Angeles grade A | 177 (10.0) | 181 (21.5) |
| Los Angeles grade B | 58 (3.3) | 38 (4.5) |
| Los Angeles grade C | 6 (0.3) | 10 (1.2) |
| Los Angeles grade D | 0 (0) | 1 (0.1) |
| Barrett's oesophagus | 0 (0) | 2 (0.2) |
Values are number (%).