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["Table 3. The risk of bias of the included studies"]
["Study",null,"Selection bias",null,"Performance bias","Detection bias","Attrition bias","Reportion bias","Other bias",null,null,"sads"]
[null,null,"Random sequence generation","Allocation concealment","Blinding of participants and personnel","Blinding of outcome assessment ","Incomplete outcome data","Selective reporting","Other sources of bias"]
["Albumin"]
[null,"Martin et al, 2003","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Martin et al, 2005","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk"]
["Antioxidants"]
[null,"Teodoro et al, 2011","Low risk","Unclear","High risk","Low risk","Low risk","Low risk","High riskc"]
[null,"Gadek et al, 1999","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","High riskc"]
[null,"Pierre et al, 2006","Low risk","Low risk","High risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Elamin et al, 2012","Unclear","Unclear","Low risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Kunihiro et al, 2015","Unclear","Unclear","High risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Rice et al, 2012","Low risk","Low risk","High risk","Low risk","Low risk","Low risk","High riska"]
["NAC"]
[null,"Bernard et al, 1997","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Guido et al, 1997","Unclear","Unclear","Low risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Ortolani et al, 2000","Unclear","Unclear","High risk","Unclear","Low risk","Low risk","Low risk"]
[null,"Jepsen et al, 1992","Unclear","Unclear","Unclear","Low risk","Low risk","Low risk","Low risk"]
[null,"Moradi et al, 2009","Unclear","Unclear","High risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Peter et al, 1993","Unclear","Unclear","Unclear","Low risk","Low risk","Low risk","Low risk"]
["Selenium"]
[null,"Mahmoodpoor et al, 2019 ","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","High riska"]
["Vitamin"]
[null,"Fowler et al, 2019 ","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk"]
["Others"]
[null,"ARDS Network, 2002","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","High riskb"]
[null,"Bernard et al, 1997","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk","Low risk"]
[null,"Peter et al, 2008","Unclear","Unclear","Unclear","Low risk","Low risk","Low risk","Low risk"]
[]
["a The results of this study might be affect by co-analysis with another study."]
["b The results of this study might be affect by concurrently enrolling patients in ARDSnet Study 01, which compared 6 mL/kg tidal volume to 12 mL/kg tidal volume. "]
["c The results of this study might be affect by the large drop-out."]