Table 3.
Meta-analysis of reported clinicopathological characteristics in the included studies.
| Test for heterogeneity | ||||||
| Parameters | Number of studies | OR (95%CI) | P value | I2(%) | P | Statistic model |
| Age (<60 vs ≥60) | 4 | 1.073 (0.639–1.800) | .790 | 50.20 | .110 | Random |
| Gender (male vs female) | 8 | 0.997 (0.756–1.314) | .981 | 33.40 | .161 | Fixed |
| Smoking (yes vs no) | 4 | 1.765 (1.120–2.782) | .014 | 49.70 | .113 | Fixed |
| Histological differentiation (poor vs moderate or well) | 3 | 0.814 (0.596–1.112) | .196 | 0.00 | .712 | Fixed |
| Nodal metastasis (absent vs present) | 7 | 0.503 (0.303–0.835) | .008 | 63.00 | .013 | Random |
| Histopathological stage (I-II vs III-IV) | 7 | 0.814 (0.596–1.112) | .196 | 47.40 | .007 | Random |
| Tumor stage (T1-T2 vs T3-T4) | 4 | 0.729 (0.262–2.029) | .545 | 76.80 | .005 | Random |