Table 2. Sensitivity analysis.

Outcomes	Excluding study	OR and 95% CI	P value	Heterogeneity (%)	P value for heterogeneity
30-day survival rate	Shaw 2006	1.69 (0.95–3.03)	0.076	0.0	0.955
	Mathus-Vliegen 1994	1.49 (0.84–2.65)	0.168	0.0	0.957
	Mazzini 1995	1.58 (0.91–2.73)	0.105	0.0	0.935
	Spataro 2011	1.59 (0.93–2.71)	0.092	0.0	0.966
	Blondet 2010	1.65 (0.95–2.87)	0.078	0.0	0.951
	Thornton 2002	1.55 (0.89–2.68)	0.120	0.0	0.947
	Allen 2013	1.55 (0.86–2.79)	0.141	0.0	0.937
	Desport 2005	1.71 (0.98–3.00)	0.060	0.0	0.979
	ProGas Study Group 2015	1.41 (0.76–2.61)	0.278	0.0	0.969
	Chio 2004	1.64 (0.94–2.86)	0.080	0.0	0.949
10-month survival rate	Shaw 2006	1.25 (0.65–2.39)	0.500	55.5	0.028
	Mathus-Vliegen 1994	1.28 (0.69–2.39)	0.434	54.9	0.030
	Mazzini 1995	1.17 (0.61–2.24)	0.641	54.7	0.031
	Spataro 2011	1.25 (0.69–2.25)	0.458	55.5	0.028
	Blondet 2010	1.12 (0.62–2.02)	0.709	50.0	0.051
	Thornton 2002	1.09 (0.64–1.87)	0.741	41.8	0.100
	Desport 2005	1.44 (0.81–2.53)	0.212	44.6	0.082
	ProGas Study Group 2015	1.18 (0.56–2.51)	0.660	56.2	0.025
	Chio 2004	1.38 (0.91–2.10)	0.125	20.2	0.269
20-month survival rate	Shaw 2006	1.94 (1.16–3.26)	0.012	0.0	0.490
	Mathus-Vliegen 1994	2.04 (1.22–3.40)	0.006	0.0	0.514
	Mazzini 1995	1.68 (0.99–2.85)	0.055	0.0	0.832
	Spataro 2011	2.13 (1.16–3.92)	0.015	0.0	0.510
	Blondet 2010	1.86 (1.11–3.12)	0.018	0.0	0.545
	Thornton 2002	2.02 (1.20–3.39)	0.008	0.0	0.497
	Desport 2005	2.18 (1.31–3.62)	0.003	0.0	0.762
30-month survival rate	Shaw 2006	1.25 (0.74–2.10)	0.409	0.0	0.928
	Mathus-Vliegen 1994	1.28 (0.76–2.17)	0.352	0.0	0.913
	Spataro 2011	1.34 (0.61–2.97)	0.463	0.0	0.917
	Blondet 2010	1.22 (0.73–2.03)	0.451	0.0	0.993
	Thornton 2002	1.32 (0.77–2.23)	0.310	0.0	0.929
	Desport 2005	1.30 (0.77–2.18)	0.320	0.0	0.923

*OR, odds ratio; CI, confidence interval