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. 2013 Apr 24;13:24. doi: 10.1186/1471-2466-13-24

Table 1.

Risk of bias within studies

Source Randomization Allocation concealment Blinding of participants & personnel Blinding of outcome assessment Incomplete data outcome Selective reporting
Dugger et al. 2010
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Unclear risk
Hewitt et al., 2010
Low risk
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Lowder et al., 2010
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Unclear risk
Pastva et al., 2005
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Unclear risk
Pastva et al., 2004
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Unclear risk
Silva et al., 2010
Low risk
Low risk
Low risk
Low risk
Unclear risk
Unclear risk
Vieira et al., 2011
Low risk
Low risk
Low risk
Low risk
Low risk
Unclear risk
Vieira et al., 2009
Low risk
Low risk
Low risk
Low risk
Low risk
Unclear risk
Vieira et al., 2008
Low risk
Low risk
Low risk
Low risk
Low risk
Unclear risk
Vieira et al., 2007 Low risk Low risk Low risk Low risk Low risk Unclear risk