Basic characteristics of the study population (n=102 665)
| Age (mean±SD) | 47.6±14.4 |
| Gender | |
| Male | 54384 (53.0%) |
| Female | 48281 (47.0%) |
| Alarm features | |
| Present | 15235 (14.8%) |
| Absent | 87430 (85.2%) |
| Malignancy (n=4362) | |
| Gastric | 2871 (65.8%) |
| Oesophageal | 1438 (33.0%) |
| Duodenal | 33 (0.7%) |
| Synchronous | 20 (0.5%) |