Table 2.
Frequency distributions of selected variables between gastric cancer cases and cancer-free controls n (%)
| Variables | Cases (n = 322) | Controls (n = 351) | P1 |
| Age (yr) | |||
| < 60 | 129 (40.1) | 153 (43.6) | 0.354 |
| ≥ 60 | 193 (59.9) | 198 (56.4) | |
| Sex | |||
| Male | 215 (66.8) | 226 (64.4) | 0.516 |
| Female | 107 (33.2) | 125 (35.6) | |
| Smoking status | |||
| Never | 181 (56.2) | 228 (65.0) | 0.020 |
| Regular | 141 (43.8) | 123 (35.0) | |
| Drinking status | |||
| Never | 217 (67.4) | 239 (68.1) | 0.846 |
| Regular | 105 (32.6) | 112 (31.9) | |
| Tumor site2 | |||
| Cardia | 149 (48.1) | ||
| Non-cardia | 161 (51.9) | ||
| Histological types2 | |||
| Intestinal | 162 (52.3) | ||
| Diffuse | 148 (47.7) | ||
| Depth of tumor infiltration2 | |||
| T1 | 80 (25.8) | ||
| T2 | 68 (22.0) | ||
| T3 | 112 (36.1) | ||
| T4 | 50 (16.1) | ||
| Lymph node metastasis2 | |||
| Negative | 166 (52.9) | ||
| Positive | 148 (47.1) | ||
1
Two-sided χ2 test for the frequency distribution of selected variables between gastric cancer cases and cancer-free controls;
2
No. of subjects in cases (n = 310 for tumor site, n = 310 for histological types, n = 310 for depth of tumor infiltration, and n = 314 for lymph node metastasis) were less than the total number (n = 322) because some information was not obtained.