Subgroup | No. of studies | HR | 95% CI | P-value | I2 (%) |
---|---|---|---|---|---|
Single centre studies | |||||
Univariate analysis | 8 | 1.52 | 1.39, 1.67 | < 0.001 | 29 |
Multivariate analysis | 13 | 1.53 | 1.22, 1.91 | < 0.001 | 76 |
Multicentre studies | |||||
Univariate analysis | 7 | 1.54 | 1.36, 1.74 | < 0.001 | 0 |
Multivariate analysis | 7 | 1.67 | 1.41, 1.99 | < 0.001 | 51 |
Western studies | |||||
Univariate analysis | 8 | 1.46 | 1.34, 1.59 | < 0.001 | 0 |
Multivariate analysis | 11 | 1.55 | 1.25, 1.92 | < 0.001 | 87 |
Eastern studies | |||||
Univariate analysis | 7 | 1.82 | 1.55, 2.15 | < 0.001 | 0 |
Multivariate analysis | 10 | 1.62 | 1.40, 1.87 | < 0.001 | 35 |