Table 1. Frequency distributions of selected characteristics of gastric cancer cases and cancer-free controls.
| Variables | Cases No. (%) | Controls No. (%) | Pa | |
| All subjects | 1,117 (100.0) | 1,146 (100.0) | ||
| Age, yr | 0.321 | |||
| Range | 21–86 | 22–86 | ||
| Meanb | 58.6±11.38 | 59.3±11.30 | ||
| Age group | ||||
| ≤50 | 234 (20.4) | 233 (20.9) | ||
| 51–60 | 375 (32.7) | 380 (34.0) | ||
| 61–70 | 370 (32.3) | 335 (30.0) | ||
| >70 | 167 (14.6) | 169 (15.1) | ||
| Sex | 0.479 | |||
| Males | 793 (71.0) | 798 (69.6) | ||
| Females | 324 (29.0) | 348 (30.4) | ||
| Drinking status | 0.015 | |||
| Ever | 267 (23.9) | 327 (28.5) | ||
| Never | 850 (76.1) | 819 (71.5) | ||
| Smoking status | <0.0001 | |||
| Ever | 433 (38.8) | 570 (49.7) | ||
| Never | 684 (61.2) | 576 (50.3) | ||
| Pack-years | <0.0001 | |||
| 0 | 684 (61.2) | 576 (50.3) | ||
| ≤25 (mean) | 225 (20.1) | 338 (29.5) | ||
| >25 (mean) | 208 (18.6) | 232 (20.2) | ||
| Tumor site | ||||
| GCA | 303 (27.1) | – | ||
| NGCA | 814 (72.9) | – | ||
GCA, gastric cardia adenocarcinoma; NGCA, non-gastric cardia adenocarcinoma.
a
Two-sided χ2 test for distributions between cases and controls.
b
Data were presented as mean ± SD.