Stratified analysis | No. of studies | No. of patients | HR | 95%CI | P | Heterogeneity | |
---|---|---|---|---|---|---|---|
I 2 | P | ||||||
cutoff | |||||||
 <0.3 | 7 | 633 | 2.195 | 0.884–5.446 | 0.009 | 74.50% | 0.001 |
  ≥ 0.3 | 5 | 845 | 2.128 | 1.341–3.378 | 0 | 0 | 0.440 |
region I | |||||||
 Asian region | 9 | 1314 | 2.195 | 1.352–9.980 | 0.001 | 56.20% | 0.019 |
 Non-Asian region | 3 | 164 | 1.779 | 0.356–8.896 | 0.483 | 78.30% | 0.010 |
region II | |||||||
 China | 7 | 757 | 2.729 | 1.618–4.605 | 0 | 37.10% | 0.174 |
 Others | 5 | 721 | 1.620 | 0.755–3.479 | 0.216 | 69.10% | 0.004 |