No. of studies | HR | 95%CI | P value | Heterogeneity (I2), % | ||
---|---|---|---|---|---|---|
Country | Asian | 6 | 1.73 | 1.10–2.73 | 0.02 | 60 |
Non-Asian | 4 | 0.93 | 0.89–0.97 | 0.001 | 12 | |
Stages | I–IV | 5 | 1.32 | 1.06–1.63 | 0.01 | 52 |
Follow-up period | ≥ 5 years | 4 | 1.12 | 0.94–1.34 | 0.20 | 65 |
< 5 years | 6 | 1.62 | 0.93–2.82 | 0.09 | 61 | |
Postoperative adjuvant chemotherapy | 4 | 1.61 | 0.88–2.94 | 0.12 | 54 | |
Sample size | ≥ 200 | 5 | 1.09 | 0.92–1.28 | 0.32 | 54 |
< 200 | 5 | 1.61 | 0.99–2.60 | 0.05 | 47 |