Outcome | Studies | OR | 95%CI | P value | Model | Heterogeneity | |
---|---|---|---|---|---|---|---|
I2 | P Value | ||||||
Age (< 60 vs ≥ 60) | 7 | 1.12 | 0.77–1.64 | 0.545 | Fixed | 36.7% | 0.148 |
Gender (male vs female) | 15 | 1.08 | 0.84–1.38 | 0.560 | Fixed | 0% | 0.713 |
TNM stage (III-IV vs I-II) | 12 | 3.27 | 2.43–4.39 | < 0.00001 | Fixed | 0% | 0.526 |
tumor size (≥ 5 cm vs < 5 cm) | 8 | 3.00 | 2.08–4.35 | < 0.00001 | Fixed | 0% | 0.665 |
Lymph node metastasis (positive vs negative) | 13 | 2.77 | 1.42–5.38 | 0.003 | Random | 78.5% | ≤ 0.001 |
distant metastasis (yes vs no) | 5 | 4.50 | 2.62–7.73 | < 0.00001 | Fixed | 0% | 0.604 |
Differentiation (poor vs well) | 9 | 1.39 | 0.71–2.70 | 0.340 | Random | 72.0% | ≤ 0.001 |