Table 2.
Subgroup | Studies | HR | 95%CI | P value | Model | Heterogeneity | |
---|---|---|---|---|---|---|---|
I2 | P Value | ||||||
Cancer type Digestive system cancer |
7 | 1.80 | 1.39–2.33 | 0.000 | Fixed | 0% | 0.796 |
Osteosarcoma | 2 | 1.90 | 1.22–2.97 | 0.005 | Fixed | 0% | 0.985 |
Respiratory system cancer | 3 | 1.94 | 1.20–3.15 | 0.007 | Fixed | 0% | 0.481 |
Reproductive system cancer | 5 | 1.38 | 0.72–2.62 | 0.334 | Fixed | 0% | 0.646 |
Others | 2 | 2.54 | 1.33–4.84 | 0.005 | Fixed | 0% | 0.888 |
Sample size ≧70 |
10 | 1.68 | 1.31–2.14 | 0.000 | Fixed | 0% | 0.732 |
< 70 | 9 | 2.10 | 1.58–2.79 | 0.000 | Fixed | 0% | 0.986 |
Extracted method | |||||||
Direct | 4 | 2.18 | 1.55–3.08 | 0.000 | Fixed | 0% | 0.825 |
Indirect | 15 | 1.72 | 1.38–2.15 | 0.000 | Fixed | 0% | 0.931 |
OS overall survival; HR hazard ratio; 95% CI 95% confidence interval