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Table 2 Risk of bias in included studies

From: Comparison of the quadriceps-sparing and subvastus approaches versus the standard parapatellar approach in total knee arthroplasty: a meta-analysis of randomized controlled trials

Study Random Sequence Generation Allocation concealment Blinding of participants Blinding of outcome assessment Incomplete Outcome data Selective reporting Other bias
Kim 2007 Yes (Randomization table) Unclear Unclear Yes Yes Unclear Unclear
Shen 2007 Yes (Not reported) Unclear Unclear Unclear Yes Unclear Unclear
Karpman 2009 Yes (Computer) Unclear Yes Yes Yes Unclear Unclear
Lin 2009 Yes (Computer) Yes (Sealed envelope) Yes Yes Yes Unclear Unclear
Matsumoto 2011 Yes (Not reported) Unclear Yes Unclear Yes Unclear Unclear
Chiang 2012 Yes (computer) Unclear Yes Yes Yes Yes Unclear
Lin 2013 Yes (Randomization table) Yes (Sealed envelope) Unclear Yes Yes Unclear Unclear
Tasker 2013 Yes (Randomization table) Yes (Sealed envelope) Yes Yes Yes Unclear Unclear
Xu 2013 Yes (Randomization table) Yes (Sealed envelope) Unclear Unclear Yes Unclear Unclear
Roysam 2001 Yes (Random number table) Yes (Sealed envelope) Yes Yes Yes Unclear Unclear
Weinhardt 2004 Yes (Not reported) Unclear Unclear Unclear Yes Unclear Unclear
Bridgman 2009 Yes (Computer) Yes (Telephone) Yes Yes Yes YES Unclear
Sastre 2009 Yes (Random number table) Yes (Sealed envelope) Yes Yes No Unclear Unclear
Pan 2010 Yes (Computer) Yes (Sealed envelope) Yes No Yes Unclear Unclear
Varela-Egocheaga 2010 Yes (Random number table) Unclear Unclear Unclear Yes Unclear Unclear
Van Hemert 2010 Yes (Not reported) Unclear Yes Yes Yes Unclear Unclear
Bourke 2012 Yes (Computer) Yes (Sealed envelope) Yes Yes No Unclear Unclear
Wegrzyn 2013 Yes (Computer) Unclear Yes Yes Yes Unclear Unclear
Jain 2013 Yes (Computer) Yes (Block schedule) Yes Unclear Yes Unclear Unclear
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