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. 2017 Oct 26;29(1):118–129. doi: 10.1111/clr.13097

Table 2.

Risk of bias assessment according to the Cochrane Collaboration recommendations (Higgins and Green, 2011)

References Selection bias sequence generation Selection bias allocation concealment Performance bias Detection bias Attrition bias Selective reporting bias Other potential risk of bias
Andersson et al. (1999) Low High High High Low Low High
Andersson et al. (2003) Low High High High Low Low Low
Andersson et al. (2001) Low High High High Low High High
Gallucci, Grutter, Chuang et al. (2011) Unclear High High High Unclear Low High
Gallucci, Grutter, Nedir et al. (2011) Low Low Low Low Low Low High
Patil et al. (2014) Unclear High High Low High High Low
Canullo, Genova et al. (2016) and Canullo, Tallarico et al. (2016) Low Low Low Low Low High Low
Baldini et al. (2016) Low Low Low Low Unclear Low High
Carrillo de Albornoz et al. (2014) Low Low Low Low Low Low High
Fenner et al. (2016) Unclear High High High Low Low Low
Hosseini et al. (2011) Low Low High Low Low Low Low
Van Assche et al. (2012) Low High High Unclear Low Low High
Nicu et al. (2012) Low High High High Low Low Low
Weinlander et al. (2011) Low High High High Low High High
Sailer et al. (2009) Unclear High High High Low High High
Zembic et al. (2009) Low High High High Low High Low
Zembic et al. (2013) Unclear High High High Low Low Low
Wittneben et al. (2017) Low Low Low Low Low Low High