Table 1.
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 bias | |
---|---|---|---|---|---|---|---|
Ahmad, 2009 | Low | Low | High | Low | High | Unclear | High |
Carroll, 2005 | Low | Unclear | High | High | High | High | Unclear |
Humphreys, 2011 | Low | Low | High | High | Unclear | Unclear | High |
Kataoka, 2010 | Low | Unclear | Unclear | Low | Low | Low | High |
Klevens, 2012a | Low | Low | Low | High | Low | Unclear | High |
Koziol-McLain, 2010 | Low | Low | High | Low | Unclear | Unclear | Low |
MacMillan, 2006 | Low | High | High | High | Unclear | Low | High |
MacMillan, 2009 | Low | High | High | Low | Low | Low | High |
Rhodes, 2002 | High | Unclear | High | Low | Unclear | Low | High |
Rhodes, 2006 | Low | Low | High | Unclear | Unclear | High | High |
Trautman, 2007 | High | High | High | Unclear | Unclear | Unclear | High |