Subgroup analysis | No. of studies | Pooled HRs | Heterogeneity | |
---|---|---|---|---|
Fixed | I2 | p -value | ||
Type of cancer | ||||
Non-digestive system carcinoma | 3 | 0.22[0.11–0.44] | 0% | 0.866 |
Digestive system carcinoma | 3 | 0.30[0.17–0.50] | 0% | 0.748 |
Sample size | ||||
< 100 | 3 | 0.23[0.11–0.46] | 0% | 0.806 |
≥ 100 | 3 | 0.28[0.17–0.48] | 0% | 0.704 |
Follow-up time | ||||
< 100 | 3 | 0.28[0.15–0.53] | 0% | 0.546 |
≥ 100 | 3 | 0.25[0.14–0.44] | 0% | 0.973 |
NOS score | ||||
< 7 | 2 | 0.20[0.08–0.51] | 0% | 0.627 |
≥ 7 | 4 | 0.28[0.18–0.46] | 0% | 0.873 |