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Demographic characteristics of the study subjects
| Characteristics | Total subjects (n=862) | Case group (n=369) | Control group (n=493) |
|---|---|---|---|
| Age (years) | |||
| ≥ 60 | 416 | 179 (48.5%) | 237 (48.1%) |
| < 60 | 446 | 190 (51.5%) | 256 (51.9%) |
| Sex | |||
| Male | 601 | 261 (70.7%) | 340 (69.0%) |
| Female | 261 | 108 (29.3%) | 153 (31.0%) |
| TNM stage | |||
| I | 46 | ||
| II | 72 | ||
| III | 210 | ||
| IV | 41 | ||
| Lymph node metastasis | |||
| N0 | 88 | ||
| N1 | 86 | ||
| N2 | 81 | ||
| N3 | 114 |
