Table 2 Summary of risk of bias assessment
Studies | Cochrane Collaboration tool | TESTEX | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other sources of bias | Total score (15 points) | Study quality score (5 points) | Study reporting score (10 points) | |
Carmack et al. [26] | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | 6 | 2 | 4 |
Giannaki et al. [27] | Unclear | Unclear | High bias | Unclear | Low bias | Low bias | Unclear | 7 | 2 | 5 |
van Vilsteren et al. [28] | Unclear | Unclear | Unclear | Unclear | High bias | Unclear | Low bias | 8 | 1 | 7 |
Kouidi et al. [29] | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | 8 | 2 | 6 |
Ouzouni et al. [30] | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | 8 | 2 | 6 |