Table 1.
Risk of bias within studies
| Source | Randomization | Allocation concealment | Blinding of participants & personnel | Blinding of outcome assessment | Incomplete data outcome | Selective reporting |
|---|---|---|---|---|---|---|
| Dugger et al. 2010 |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
Unclear risk |
| Hewitt et al., 2010 |
Low risk |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
| Lowder et al., 2010 |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
Unclear risk |
| Pastva et al., 2005 |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
Unclear risk |
| Pastva et al., 2004 |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
Unclear risk |
| Silva et al., 2010 |
Low risk |
Low risk |
Low risk |
Low risk |
Unclear risk |
Unclear risk |
| Vieira et al., 2011 |
Low risk |
Low risk |
Low risk |
Low risk |
Low risk |
Unclear risk |
| Vieira et al., 2009 |
Low risk |
Low risk |
Low risk |
Low risk |
Low risk |
Unclear risk |
| Vieira et al., 2008 |
Low risk |
Low risk |
Low risk |
Low risk |
Low risk |
Unclear risk |
| Vieira et al., 2007 | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear risk |