Table 1. Baseline demographic and clinical characteristics of study populations.
| Characteristics | Suzhou population | Guangzhou population | Overall | |||
|---|---|---|---|---|---|---|
| N | (%) | N | (%) | N | (%) | |
| Age(years) | ||||||
| ≤40 | 41 | (11.5) | 42 | (12.9) | 83 | (12.1) |
| 40-60 | 203 | (56.6) | 187 | (57.3) | 390 | (57.0) |
| ≥60 | 114 | (31.9) | 97 | (29.8) | 211 | (30.9) |
| Sex | ||||||
| Male | 281 | (78.5) | 271 | (83.1) | 552 | (80.7) |
| Female | 77 | (21.5) | 55 | (16.9) | 132 | (19.3) |
| Body mass index | ||||||
| ≤20 | 79 | (22.1) | 59 | (18.1) | 138 | (20.2) |
| 20-28 | 255 | (71.2) | 245 | (75.2) | 500 | (73.1) |
| ≥28 | 24 | (6.7) | 22 | (6.7) | 46 | (6.7) |
| Family history | ||||||
| Yes | 29 | (8.1) | 31 | (9.5) | 60 | (8.8) |
| No | 329 | (91.9) | 295 | (90.5) | 624 | (91.2) |
| Smoking | ||||||
| Never | 126 | (35.2) | 109 | (33.4) | 235 | (34.4) |
| Ever | 232 | (64.8) | 217 | (66.6) | 449 | (65.6) |
| Drinking | ||||||
| Never | 187 | (52.2) | 169 | (51.8) | 356 | (52.0) |
| Ever | 171 | (47.8) | 157 | (48.2) | 328 | (48.0) |
| Pathological type | ||||||
| Highly | 62 | (17.3) | 65 | (19.9) | 127 | (18.6) |
| Moderately | 201 | (56.1) | 178 | (54.6) | 379 | (55.4) |
| Low | 95 | (26.5) | 83 | (25.5) | 178 | (26) |
| Stage | ||||||
| I | 38 | (10.6) | 41 | (12.6) | 79 | (11.5) |
| II | 162 | (45.3) | 142 | (43.6) | 304 | (44.5) |
| III | 158 | (44.1) | 143 | (43.8) | 301 | (44.0) |