Table 2 Risk of bias assessment
Study, year | Intervention independent of other changes? | Shape intervention effect pre-specified? | Intervention unlikely to affect data collection? | Knowledge of allocated interventions adequately prevented? | Incomplete outcome data adequately assessed? | Free from selective outcome reporting? | Free from other risks of bias | Risk of bias |
|---|---|---|---|---|---|---|---|---|
Villalbà 2011 | High | Low | Low | Low | Low | Low | Low | Low |
Fernando 2013 | High | Low | Low | Low | Low | High | Low | Moderate |
Sericea Stallings-Smith 2013 | High | Low | Low | Low | Low | Low | Low | Low |
Carl Bartecchi 2006 | High | Low | Low | Low | Low | Low | High | Moderate |
Shetty, K. D 2009 | High | High | Low | Low | Low | Low | High | High |
Dove 2010 | High | Low | Low | Low | Low | High | Low | Moderate |
McAlister 2010 | High | Low | Low | Low | High | High | High | High |
Brad Rodu 2012 | High | Low | Low | Low | Low | High | High | High |
Tania 2016 | High | Low | Low | Low | Low | Low | Low | Low |
TQ Thach 2016 | High | Low | Low | Low | Low | Low | Low | Low |