Combined HR analysis.
| HR (95% CI) | Z | P | |
|---|---|---|---|
| Univariate analysis | 1.98 (1.64–2.40) | 7.05 | < 0.0001 |
| Multivariate analysis | 1.42 (1.16–1.72) | 3.48 | < 0.0001 |
Univariate analysis: one paper[10] did not provide the HR value of the univariate analysis; thus only the remaining five were analyzed.