Table 2.
Distribution of cases and controls according to selected covariates.
| Variables | Cases | Controls | ||
|---|---|---|---|---|
| n | % | n | % | |
| Sex | ||||
| Male | 3790 | 63.7 | 7454 | 58.3 |
| Female | 2156 | 36.3 | 5322 | 41.7 |
| Age | ||||
| 18–49 | 759 | 12.8 | 2553 | 20.0 |
| 50–65 | 2184 | 36.7 | 4724 | 37.0 |
| 65–74 | 2171 | 36.5 | 3940 | 30.8 |
| 75–106 | 832 | 14.0 | 1557 | 12.2 |
| Missing | 0 | 0.0 | 2 | 0.0 |
| Socioeconomic status | ||||
| Low | 3799 | 63.9 | 6488 | 50.8 |
| Medium | 1543 | 26.0 | 3760 | 29.4 |
| High | 501 | 8.4 | 2198 | 17.2 |
| Missing | 103 | 1.7 | 330 | 2.6 |
| Smoking habit (1) | ||||
| Current | 1720 | 28.9 | 3255 | 25.5 |
| No | 4132 | 69.5 | 9386 | 73.4 |
| Missing | 94 | 1.6 | 135 | 1.1 |
| Alcohol intake g of ethanol/day | ||||
| Never | 1526 | 25.7 | 3375 | 26.4 |
| Low (≤12) | 1190 | 20.0 | 3468 | 27.1 |
| Intermediate (>12–47) | 1745 | 29.4 | 3047 | 23.9 |
| High (>47) | 860 | 14.5 | 1353 | 10.6 |
| Missing | 625 | 10.5 | 1533 | 12.0 |
| Fruit intake (2) | ||||
| Low | 2157 | 36.3 | 3701 | 29.0 |
| Medium | 1872 | 31.5 | 4109 | 32.2 |
| High | 1685 | 28.3 | 4293 | 33.6 |
| Missing | 232 | 3.9 | 673 | 5.3 |
| H. pylori infection | ||||
| Positive | 688 | 11.6 | 3662 | 28.7 |
| Negative | 1661 | 27.9 | 1252 | 9.8 |
| Missing | 3597 | 60.5 | 7862 | 61.5 |
(1) No: never and former; (2) defined according to study-specific tertiles.