Table 1.
Characteristics of study population.
| Characteristics | No.a | (%) | |
|---|---|---|---|
| Gender | Male | 971 | 47.1% |
| Female | 1091 | 52.9% | |
| Age | ≤39 | 479 | 23.2% |
| 40-49 | 753 | 36.5% | |
| 50-59 | 532 | 25.8% | |
| ≥60 | 298 | 14.5% | |
| Years of schooling | 0-5 | 688 | 33.4% |
| 6-8 | 701 | 34.0% | |
| 9+ | 672 | 32.6% | |
| Years of refrigerator use | 0-9 | 276 | 13.4% |
| 10-19 | 348 | 16.9% | |
| 20-29 | 615 | 29.8% | |
| 30+ | 823 | 39.9% | |
| Cigarette smoking | Never | 1459 | 70.8% |
| Ever | 603 | 29.2% | |
| Family history of gastric cancer | No | 1767 | 85.7% |
| Yes | 294 | 14.3% | |
| Hp status | No Hp | 181 | 8.8% |
| cagA− Hp | 567 | 27.5% | |
| cagA+ Hp | 1314 | 63.7% | |
| Histological diagnosis | Normal | 10 | 0.5% |
| Superficial gastritis | 78 | 3.8% | |
| Chronic gastritis | 979 | 47.5% | |
| Atrophic gastritis | 323 | 15.7% | |
| Intestinal metaplasia | 560 | 27.2% | |
| Dysplasia | 112 | 5.4% | |
| Blood groups | O | 1202 | 58.3% |
| A | 690 | 33.5% | |
| B | 141 | 6.8% | |
| AB | 29 | 1.4% |
a
2200 subjects accepted to participate in the study. For 138 subjects the DNA from biopsies was not available anymore or the quality was insufficient for genotyping, leaving thus a total of 2062 subjects who were included in statistical analyses.