TIPS improves liver transplantation-free survival in cirrhotic patients with refractory ascites: An updated meta-analysis

Table 4 Risk of bias assessment of the included studies

Risk of bias	Lebrec et al[10]	Rössle et al[9]	Ginés et al[8]	Sanyal et al[11]	Salerno et al[12]	Narahara et al[13]
Generation of random allocation sequence (risk)	NR (unclear)	NR (unclear)	NR (unclear)	NR (unclear)	NR (unclear)	NR (unclear)
Concealment of allocation sequence (risk)	Sealed opaque envelopes (low)	NR (unclear)	Sealed opaque envelopes (low)	Sealed opaque envelopes (low)	Sealed opaque envelopes (low)	Sealed opaque envelopes (low)
Blinding of participants and personnel (risk)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)
Blinding of outcome assessment (risk)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)	Unblinded (high)
Incomplete outcome data (risk)	Intention-to-treat analysis, description of drop-outs (low)	Intention-to-treat analysis, description of drop-outs (low)	Intention-to-treat analysis, description of drop-outs (low)	Intention-to-treat analysis, description of drop-outs (low)	Intention-to-treat analysis, description of drop-outs (low)	Intention-to-treat analysis, description of drop-outs (low)
Selective outcome reporting (risk)	All of the outcomes in the methods section were reported in the results section (low)	All of the outcomes in the methods section were reported in the results section (low)	All of the outcomes in the methods section were reported in the results section (low)	All of the outcomes in the methods section were reported in the results section (low)	All of the outcomes in the methods section were reported in the results section (low)	All of the outcomes in the methods section were reported in the results section (low)

NR: Not reported.