Table 3.
Results of risk of bias evaluation performed for clinical studies according to the Downs and Black scale tool.
| Study | Reporting | External Validity | Bias | Confounding | Power | Overall | Risk of Bias * |
|---|---|---|---|---|---|---|---|
| 0–11 | 0–3 | 0–7 | 0–6 | 0–1 | 0–28 | ||
| Dai et al. [23] | 10 of 11 | 1 of 3 | 3 of 7 | 3 of 6 | 0 of 1 | 17 of 28 | Medium |
| Durrett [20] | 6 of 11 | 1 of 3 | 2 of 7 | 3 of 6 | 0 of 1 | 12 of 28 | Medium |
| Garino et al. [16] | 9 of 11 | 1 of 3 | 4 of 7 | 2 of 6 | 1 of 1 | 17 of 28 | Medium |
| Kravitz et al. [22] | 10 of 11 | 1 of 3 | 4 of 7 | 3 of 6 | 0 of 1 | 18 of 28 | Medium |
| Simon et al. [21] | 9 of 11 | 1 of 3 | 3 of 7 | 3 of 6 | 0 of 1 | 16 of 28 | Medium |
* Risk of Bias—High (0–8); Medium (9–18); Low (19–28).