Variable | No. studies | Model | OR (95% CI) | Heterogeneity | Begg’s test | Egger’s test | |
I2 (%) | P-value (Q-test) | ||||||
Gendera | 14 | Fixed | 1.12 (0.91, 1.37) | 12.9 | 0.312 | 0.661 | 0.285 |
Tumor sizeb | 8 | Fixed | 1.11 (0.82, 1.49) | 39.6 | 0.115 | 0.902 | 0.139 |
TNM stagec | 12 | Random | 2.68 (1.61, 4.48) | 78.4 | 0.000 | 0.086 | 0.160 |
Invasion depthd | 8 | Random | 2.05 (1.32, 3.19) | 54.0 | 0.033 | 0.174 | 0.500 |
Lymph node metastasise | 14 | Random | 1.95 (1.29, 2.96) | 71.8 | 0.000 | 0.443 | 0.847 |
Degree of differentiationf | 11 | Random | 1.17 (0.63, 2.16) | 82.3 | 0.000 | 0.436 | 0.521 |