Table 2. The sensitivity analysis for the meta-analysis.

Subgroup	HR (95%CI)	p value
Type of publication
Reported	2.24 (1.66–3.01)	0.27
Recalculated (by Parmar’s method)	1.76 (1.30–2.40)
Analysis of hazard ratio
Multivariate	2.53 (1.66–3.86)	0.74
Univariate	2.29 (1.50–3.50)
Sample collection
Serum	1.65 (0.99–2.74)	0.37
Plasma	2.13 (1.69–2.70)