Study ID | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blinding of participants and personnel (performance bias) | Blinding of outcome assessment (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) | Other sources of bias |
---|---|---|---|---|---|---|---|
Althabe [2004] | + | + | + | + | + | + | ? |
Begley [2011] | + | + | – | ? | + | ? | + |
Chaillet [2015] | + | ? | + | + | + | + | ? |
Chambliss [1992] | ? | + | + | + | + | ? | + |
Gagnon [1997] | + | + | – | + | + | ? | + |
Gu [2013] | + | + | ? | + | + | ? | + |
Harvey [1996] | + | + | ? | ? | + | ? | ? |
Hodnett [2002] | + | + | – | ? | + | ? | + |
Homer [2001] | + | + | + | + | + | + | + |
Janssen [2006] | + | + | + | + | + | ? | ? |
Kashanian [2010] | ? | + | ? | ? | + | ? | + |
McLaughlin [2012] | + | + | ? | + | + | ? | + |
Rowley [1995] | + | ? | – | – | ? | ? | + |
Tracy [2013] | + | + | – | + | + | + | + |