Age of patients with various forms of GORD
| ICD code | GORD form | n | Age (years) | SD |
| VA population | 3411453 | 57.5 | NA | |
| 530.1 | Oesophagitis | 108397 | 60.6 | 12.6 |
| 530.2 | Oesophageal ulcer | 16011 | 62.2 | 11.9 |
| 530.3 | Oesophageal stricture | 22507 | 64.2 | 10.8 |
| 552.3 | Strictured hiatus hernia | 1049 | 62.9 | 12.4 |
| 553.3 | Hiatus hernia | 104356 | 61.5 | 12.3 |
| 787.1 | Pyrosis | 1773 | 61.9 | 11.6 |
Source: patient treatment files 1981–94.