Table 1. Distribution of selected demographic variables and risk factors in ESCC cases and controls.
| Cases (n = 629) | Controls (n = 686) | ||||
| Variable | n | (%) | n | (%) | P a |
| Age (years) mean ± SD | 62.85 (±8.13) | 62.58 (±7.89) | 0.541 | ||
| Age (years) | 0.155 | ||||
| < 63 | 310 | (49.28) | 365 | (53.21) | |
| ≥ 63 | 319 | (50.72) | 321 | (46.79) | |
| Sex | 0.185 | ||||
| Male | 444 | (70.59) | 461 | (67.20) | |
| Female | 185 | (29.41) | 225 | (32.80) | |
| Tobacco use | <0.001 | ||||
| Never | 355 | (56.44) | 499 | (72.74) | |
| Ever | 274 | (43.56) | 187 | (27.26) | |
| Alcohol use | <0.001 | ||||
| Never | 428 | (68.04) | 526 | (76.68) | |
| Ever | 201 | (31.96) | 160 | (23.32) | |
a
Two-sided χ 2 test and student t test; Bold values are statistically significant (P<0.05).