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Table 2 Risk of bias in include studies

From: The efficacy of thymosin α1 as immunomodulatory treatment for sepsis: a systematic review of randomized controlled trials

The first author

Publication year

Adequate sequence generation

Allocation concealment

Blinding (Participant)

Blinding

(Personnel)

Blinding (Outcome assessor)

Incomplete outcome data (attrition bias)

Selective reporting (reporting bias)

Other bias

Chen XL

2009

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Cheng AB

2010

Unclear

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Gui CM

2012

High risk

High risk

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Hu XY

2007

Unclear

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Gong ZH

2011

Low risk

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Chen J

2007

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Fan JB

2014

Unclear

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Lei S

2005

Unclear

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Li YN

2009

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Wu JN

2004

Low risk

Low risk

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Wu JF

2013

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Wu JF

2014

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Low risk

Zhang BJ

2014

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Zhang Z

2006

Unclear

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Zhou LX

2009

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Zhao MY

2007

Low risk

Low risk

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Zhou Q

2011

Low risk

Low risk

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Zhu SJ

2015

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk

Lu FP

2015

Unclear

Unclear

Unclear

Unclear

Unclear

Low risk

Low risk

Low risk