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Bias risk assessment.
| Authors | Report (10 points) | External validity (3 points) | Bias (7 points) | Confusion variable (6 points) | Power (1 point) | Total (27 points) |
|---|---|---|---|---|---|---|
| Abd El-Kader & Al-Shreef8 2018 | 9 | 3 | 5 | 3 | 1 | 21 |
| Liem et al.9 2017 | 9 | 1 | 5 | 3 | 1 | 19 |
| Hedreville et al.10 2014 | 6 | 1 | 3 | 2 | 1 | 13 |
| Balayssac-Siransy et al.11 2011 | 6 | 1 | 3 | 2 | 1 | 13 |
| Lima Filho et al.12 2014 | 7 | 2 | 3 | 2 | 0 | 15 |
| Waltz et al.13 2012 | 7 | 1 | 3 | 2 | 1 | 14 |
