Essential phospholipids for nonalcoholic fatty liver disease associated with metabolic syndrome: A systematic review and network meta-analysis

Table 2 Summary of the authors’ assessment of the risk of bias for each item in the Cochrane quality assessment

Ref.	Selection bias (sequence generation)	Selection bias (allocation concealment)	Performance bias (blinding)	Detection bias	Attrition bias (incomplete outcomes data)	Reporting bias (selective outcome reporting)	Other bias
Yin et al[23], 2000	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Poongothai et al[25], 2005	High risk	High risk	High risk	High risk	Low risk	Low risk	Low risk
Arvind et al[26], 2006	High risk	High risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Sun et al[21], 2008	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Wu et al[22], 2009	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Li et al[18], 2013	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Sas et al[19], 2013	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk
Dajani et al[24], 2015	High risk	High risk	High risk	High risk	Low risk	Unclear risk	Low risk
Shan et al[20], 2015	Unclear risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk
Li et al[17], 2017	Low risk	Unclear risk	Unclear risk	Unclear risk	Low risk	Low risk	Low risk

The risk of bias was deemed unclear when the study did not specify the required information (e.g., a randomized study that does not specify the method of randomization or allocation concealment).