Table 2.

Risk of Bias Summary per Cochrane Metrics

First Author, Year (Reference No.)Selection BiasPerformance BiasDetection BiasAttrition BiasReporting BiasOther Bias
PEG monotherapy
 van der Lely et al., 2001 (12)NENENE+
 Rose and Clemmons, 2002 (21)NENENE+
 Parkinson et al., 2002 (22)NENENE
 Sesmilo et al., 2002 (23)NENENE+
 Drake et al., 2003 (24)NENENE
 Barkan et al., 2005 (25)NENENE
 Plockinger and Router, 2008 (26)NENENE
 Ghigo et al., 2009 (27)NENENE
 Trainer et al., 2009 (28)???++
 De Martino et al., 2010 (29)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2012 (30)NENENE
 Muhammad et al., 2016 (31)NENENE+
Combination therapy PEG and SSAs
 De Marinis et al., 2007 (32)NENENE
 Trainer et al., 2009 (28)???++
 Madsen et al., 2011 (33)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2017 (34)NENENE
First Author, Year (Reference No.)Selection BiasPerformance BiasDetection BiasAttrition BiasReporting BiasOther Bias
PEG monotherapy
 van der Lely et al., 2001 (12)NENENE+
 Rose and Clemmons, 2002 (21)NENENE+
 Parkinson et al., 2002 (22)NENENE
 Sesmilo et al., 2002 (23)NENENE+
 Drake et al., 2003 (24)NENENE
 Barkan et al., 2005 (25)NENENE
 Plockinger and Router, 2008 (26)NENENE
 Ghigo et al., 2009 (27)NENENE
 Trainer et al., 2009 (28)???++
 De Martino et al., 2010 (29)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2012 (30)NENENE
 Muhammad et al., 2016 (31)NENENE+
Combination therapy PEG and SSAs
 De Marinis et al., 2007 (32)NENENE
 Trainer et al., 2009 (28)???++
 Madsen et al., 2011 (33)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2017 (34)NENENE

− indicates low risk; + indicates high risk; ? indicates unclear risk of bias.

Abbreviation: NE, not evaluable.

Table 2.

Risk of Bias Summary per Cochrane Metrics

First Author, Year (Reference No.)Selection BiasPerformance BiasDetection BiasAttrition BiasReporting BiasOther Bias
PEG monotherapy
 van der Lely et al., 2001 (12)NENENE+
 Rose and Clemmons, 2002 (21)NENENE+
 Parkinson et al., 2002 (22)NENENE
 Sesmilo et al., 2002 (23)NENENE+
 Drake et al., 2003 (24)NENENE
 Barkan et al., 2005 (25)NENENE
 Plockinger and Router, 2008 (26)NENENE
 Ghigo et al., 2009 (27)NENENE
 Trainer et al., 2009 (28)???++
 De Martino et al., 2010 (29)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2012 (30)NENENE
 Muhammad et al., 2016 (31)NENENE+
Combination therapy PEG and SSAs
 De Marinis et al., 2007 (32)NENENE
 Trainer et al., 2009 (28)???++
 Madsen et al., 2011 (33)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2017 (34)NENENE
First Author, Year (Reference No.)Selection BiasPerformance BiasDetection BiasAttrition BiasReporting BiasOther Bias
PEG monotherapy
 van der Lely et al., 2001 (12)NENENE+
 Rose and Clemmons, 2002 (21)NENENE+
 Parkinson et al., 2002 (22)NENENE
 Sesmilo et al., 2002 (23)NENENE+
 Drake et al., 2003 (24)NENENE
 Barkan et al., 2005 (25)NENENE
 Plockinger and Router, 2008 (26)NENENE
 Ghigo et al., 2009 (27)NENENE
 Trainer et al., 2009 (28)???++
 De Martino et al., 2010 (29)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2012 (30)NENENE
 Muhammad et al., 2016 (31)NENENE+
Combination therapy PEG and SSAs
 De Marinis et al., 2007 (32)NENENE
 Trainer et al., 2009 (28)???++
 Madsen et al., 2011 (33)NENENE
 Urbani et al., 2013 (17)NENENE
 Auriemma et al., 2017 (34)NENENE

− indicates low risk; + indicates high risk; ? indicates unclear risk of bias.

Abbreviation: NE, not evaluable.

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