| Variable | n | % |
| Smoking |
|
|
| Yes | 435 | 49.8 |
| No | 338 | 38.7 |
| Not Informed | 100 | 11.5 |
| Alcohol intake |
|
|
| Yes | 456 | 52.2 |
| No | 317 | 36.3 |
| Not Informed | 100 | 11.5 |
| ECOG Performance Status |
|
|
| 0 | 88 | 10.1 |
| I | 472 | 54.1 |
| II | 119 | 13.6 |
| III | 31 | 3.6 |
| IV | 6 | 0.6 |
| Not informed | 157 | 18.0 |
| Blood Type |
|
|
| O+ | 279 | 31.8 |
| O− | 23 | 2.6 |
| A+ | 225 | 25.8 |
| A− | 26 | 3.0 |
| AB+ | 25 | 2.9 |
| AB− | 2 | 0.2 |
| B+ | 75 | 8.6 |
| B− | 4 | 0.5 |
| Not informed | 214 | 24.6 |
| Time from symptom onset |
|
|
| <3 months | 108 | 12.4 |
| 3 - 6 months | 231 | 26.5 |
| 7 - 9 months | 97 | 11.1 |
| 10 - 12 months | 139 | 15.9 |
| >12 months | 120 | 13.7 |
| Not Informed | 178 | 20.4 |
| H. pylori infection |
|
|
| Yes | 120 | 13.7 |
| No | 213 | 24.4 |
| No informed | 540 | 61.9 |
| Total | 873 | 100 |