Table 1.
Characteristics of ESCC cases and controls
| Variables | Cases (n=248) n (%) | Controls (n=300) n (%) | P a |
|---|---|---|---|
| Age (years), mean ± SD | 56.23 (±9.02) | 55.16 (±10.62) | 0.212 |
| Age (years) | 0.334 | ||
| <57 | 122 (49.2) | 160 (53.3) | |
| ≥57 | 126 (50.8) | 140 (46.7) | |
| Sex | 0.212 | ||
| Male | 143 (57.7) | 157 (52. 3) | |
| Female | 105 (42.3) | 143 (47.7) | |
| Differentiated status | |||
| Well differentiation | 47 (19.0) | ||
| Moderately differentiation | 152 (61.2) | ||
| Poorly differentiation | 49 (19.8) | ||
| Tumor location | |||
| Upper | 14 (5.6) | ||
| middle + lower | 234 (94.4) | ||
| Depth of invasion | |||
| T1/T2 | 98 (42.2) | ||
| T3/T4 | 134 (57.8) | ||
| Lymph node metastasis | |||
| No | 132 (53.2) | ||
| Yes | 116 (46.8) | ||
| Tumor-node-metastasis stage | |||
| I-II | 154 (64.7) | ||
| III-IV | 84 (35.3) |
a
Two-side χ2 test and student t test.