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Table 3 Cochrane’s risk of bias assessment

From: Effect of acustimulation on nausea and vomiting and on hyperemesis in pregnancy: a systematic review of Western and Chinese literature

1st author (Year) Random sequence generation Allocation concealment Blinding of participants and personnel Blinding of outcome assessment Incomplete outcome data Selective outcome reporting Other sources of bias
Acupressure finger        
Dundee 1988 High Unclear High Low High Low Unclear
Belluomini 1994 Low Unclear Low Low High High Low
Shin2007 Low Unclear Low Low Low Low Low
Rad 2012 Unclear Unclear Low Low Low Unclear Low
Jiang 2012 Unclear Unclear High Low Low Unclear unclear
Acupressure band        
O’Brien 1996 Low Low Low Low Low Unclear Low
Norheim 2001 Low Unclear Low Low Low Unclear Low
Steele 2001 Low Low Low Low Low Unclear Low
Werntoft 2001 Unclear Unclear Unclear Unclear Unclear Low Unclear
Heazell 2006 Unclear Unclear Low Low Low Low Unclear
Jamigorn 2007 Low Low Low Low Low Unclear Unclear
Can Gurkan 2008 Unclear Unclear Low Low Low Unclear Low
Saberi 2013 Low Unclear High Low Low Low Low
Acupuncture        
Knight 2001 Low Low Low Low Low Low Low
Smith 2002 Low Low Low Low High Unclear Unclear
Neri 2005 Low Unclear High Unclear Low Unclear Unclear
Zhang 2005 Low Unclear High Low Low Low Low
Liu 2007 High Unclear High Low Low Low Unclear
Wang 2008 Low Unclear High Low Low Low Unclear
Mao 2009 Low Unclear High Low Low Low Low
Liu 2011 Low Unclear High Low Low High Unclear
Ma 2013 Unclear Unclear High Unclear Low High Unclear
Auricular acupressure        
Ou 2001 Low Unclear High Low Low Low Low
Puangsricharern 2008 Low Unclear High Low Low Low Unclear
Li 2010 High Unclear High Low Low Low Low
Liu 2012 Unclear Unclear High Unclear High High Unclear
Moxa        
Fan 1995 Unclear Unclear High Unclear Low Low Unclear
Xu 2009 Unclear Unclear High Low Low Low Unclear
Lu 2012 Unclear Unclear High Low Low Unclear Unclear
  1. Higgins JPT, Green S (editors). Cochrane Handbook for Systematic Reviews of Interventions Version 5.1.0 (Updated March 2011). The Cochrane Collaboration, 2011. Available from www.cochrane-handbook.org