Table 1.
Characteristics of the interviewed subjects
| Characteristics | Gastric cancer cases (114) | Control subjects (693) | OR (95%CI) | |
| Median age | yr±SD | 59±10 | 53±10 | 1.1 (1.0–1.1)1 |
| Min (yr) | 35 | 30 | ||
| Max (yr) | 82 | 78 | ||
| Gender | Female (%) | 38 (33) | 383 (55) | 1.0 (Ref.) |
| Male (%) | 76 (67) | 310 (45) | 1.2 (0.7–2.1) | |
| F/M ratio | 1:2 | 01:00.8 | ||
| Educational level | >5 yr | 44 (38.6) | 246 (35.5) | 1.0 (Ref.) |
| ≤5 yr | 70 (61.4) | 447 (64.5) | 1.0 (0.6–1.7) | |
| Occupation | ||||
| Manual | 51 (44.7) | 375 (54.1) | 1.0 (Ref.) | |
| Office | 9 (7.9) | 87 (12.6) | 0.6 (0.2–1.3) | |
| Retired | 54 (47.4) | 231 (33.3) | 1.2 (0.7–1.9) | |
| Marriage status | ||||
| Married | 100 (87.7) | 649 (94.7) | 1.0 (Ref.) | |
| Divorce or bereft spouse | 14 (12.3) | 36 (5.3) | 1.4 (0.6–3.0) | |
| Family history of cancer | ||||
| No | 84 (76.4) | 613 (90.3) | 1.0 (Ref.) | |
| Yes | 26 (23.6) | 66 (9.7) | 3.9 (2.1–7.3)1 | |
| BMI (kg/m2) | ||||
| <20 | 56 (49.1) | 95 (13.7) | 1.0 (Ref.) | |
| 20– | 44 (38.6) | 254 (36.7) | 0.3 (0.2–0.5)1 | |
| 23– | 14 (12.3) | 344 (49.6) | 0.1 (0.03–0.12)1 | |
| Tobacco smoking habits | ||||
| Never | 51 (44.7) | 437 (63.0) | 1.0 (Ref.) | |
| Current | 36 (31.6) | 225 (32.5) | 0.6 (0.3–1.3) | |
| Former | 27 (23.7) | 31 (4.5) | 2.4 (1.0–5.8)1 | |
| Amount of former smoking (pack years) | ||||
| No | 87 (76.4) | 662 (95.6) | 1.0 (Ref.) | |
| 1–19 | 7 (6.1) | 10 (1.4) | 2.6 (0.8–8.6) | |
| 20–29 | 8 (7.0) | 11 (1.6) | 3.1 (1.1–9.0)1 | |
| ≥30 | 12 (10.5) | 10 (1.4) | 4.4 (1.7–11.9)1 | |
| Alcohol drinking habits | ||||
| Never | 78 (68.5) | 505 (72.9) | 1.0 (Ref.) | |
| Current | 11 (9.6) | 156 (22.5) | 0.2 (0.1–0.5)1 | |
| Former | 25 (21.9) | 32 (4.6) | 2.3 (1.2–4.7)1 | |
| Plasma H pylori CagA antibody | ||||
| Negative | 136 (82.4) | 107 (49.3) | 1.0 (Ref.) | |
| Positive | 29 (17.6) | 110 (50.7) | 0.2 (0.1–0.3)1 | |
| CYP1A1 genotype | ||||
| Ile/Ile | 70 (62.5) | 412 (61.0) | 1.0 (Ref.) | |
| Ile/Val | 36 (32.1) | 226 (33.4) | 0.9 (0.5–1.4) | |
| Val/Val | 6 (5.4) | 38 (5.6) | 0.7 (0.2–1.8) | |
| GSTM1 genotype | ||||
| Present | 41 (36.6) | 314 (46.5) | 1.0 (Ref.) | |
| Null | 71 (63.4) | 361 (53.5) | 2.0 (1.2–3.1)1 | |
1
Showed significant difference after adjusting co-variables.