Author; Year
|
Bias due to confounding
|
Bias in selection of participants into the study
|
Bias due to missing data
|
Bias in measurement of outcomes
|
Bias in selection of the reported result
|
Overall bias
|
---|
Gonzalez 2008 [7]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Mashour, 2008 [8]
|
Moderate
|
Low
|
Low
|
Low
|
Low
|
Low
|
Lavi2009[14]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Dargin 2013 [23]
|
Moderate
|
Low
|
Moderate
|
Low
|
Moderate
|
Moderate
|
Juvin 2003 [24]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Basaranoglu 2010 [25]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Ezri 2003 [26]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Heinrich 2013 [27]
|
Moderate
|
Low
|
Moderate
|
Low
|
Moderate
|
Moderate
|
Lee 2014 [28]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Voyagis 1998 [29]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Magalhães 2013 [30]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Turkay Aydogmus 2014 [31]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Aslani2012[32]
|
Moderate
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Combes2005[33]
|
Serious
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Yildiz 2010 [34]
|
Serious
|
Low
|
Low
|
Low
|
Moderate
|
Moderate
|
Lundstrøm 2009 [35]
|
Moderate
|
Low
|
Low
|
Low
|
Low
|
Low
|
- All parameters were assessed for their risk by using a scale that classifies them as low, moderate, serious or critical