Table 1 Risk of bias assessment.
Reference | Sequence Generation | Allocation Concealment | Blinding | Incomplete Outcome Data | Selective Reporting | Other Bias | Low Risk | High Risk | Unclear | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
Da Costa et al. (2005)[8] | Low | Low | High | Low | Low | Low | 83% | 17% | 0% | ||
Gowans et al.(2001)[9] | Unclear | Unclear | High | Unclear | Low | Low | 33% | 17% | 50% | ||
King et al. 2002)[10] | Low | High | High | Low | Low | Low | 67% | 33% | 0% | ||
Kingsley et al. (2005)[11] | Low | Unclear | High | Low | Low | Low | 67% | 17% | 17% | ||
Munguia-Izquierdo & Legaz-Arrese (2007)[12] | Unclear | Unclear | High | Unclear | Low | Low | 33% | 17% | 50% | ||
Schachter et al. (2003)[13] | Unclear | Unclear | High | Low | Low | Low | 50% | 17% | 33% | ||
Tomas-Carus et al. (2007) [14] | Unclear | Unclear | High | Low | Low | Low | 50% | 17% | 33% | ||
Low Risk | 43% | 14% | 0% | 71% | 100% | 100% | - | - | - | ||
High Risk | 0% | 14% | 100% | 0% | 0% | 0% | Â | Â | Â | ||
Unclear | 57% | 71% | 0% | 29% | 0% | 0% | - | - | - | ||