Parameters | Studies | Case number | Pooled OR(95%CI) | P | Heterogeneity | Model | Publication bias | |
---|---|---|---|---|---|---|---|---|
 |  |  |  |  | I2 | P |  |  |
Age | 5 | 406 | 1.37 [0.89, 2.13] | 0.16 | 0% | 0.72 | Fixed | 0.462 |
Gender | 17 | 1487 | 1.00 [0.78, 1.27] | 0.97 | 34% | 0.08 | Fixed | 0.343 |
TNM stage | 9 | 721 | 0.81 [0.34, 1.91] | 0.63 | 80% | < 0.00001 | Random | 0.536 |
Tumor size | 8 | 749 | 0.83 [0.60, 1.16] | 0.27 | 37% | 0.14 | Fixed | 0.536 |
Invasion depth | 6 | 591 | 0.49 [0.25, 0.96] | 0.04 | 56% | 0.04 | Random | 0.26 |
Lymphatic metastasis | 15 | 1294 | 0.28 [0.16, 0.47] | < 0.00001 | 68% | < 0.00001 | Random | 0.701 |
Distant metastasis | 3 | 246 | 0.32 [0.13, 0.76] | 0.01 | 0% | 0.42 | Fixed | 1 |
Differentiation degree | 11 | 984 | 0.34 [0.19, 0.60] | 0.0003 | 55% | 0.01 | Random | 1 |
Venous invasion | 4 | 322 | 1.11 [0.22, 5.53] | 0.9 | 82% | 0.0009 | Random | 1 |