Table 3.
Evaluation of bias risk in the included studies
| Investigators | Sample size calculation | Allocation concealment | Randomization | Losses (withdrawals/dropouts) | Masking of assessor(s) | Appropriate statistical analysis | Estimated risk of bias |
|---|---|---|---|---|---|---|---|
| Pradeep et al. 16 | 0 | 2 | 2 | 1 | 2 | 2 | High |
| Sharma and Pradeep 17 | 0 | 2 | 2 | 1 | 2 | 2 | High |
| Sharma and Pradeep 24 | 0 | 2 | 2 | 1 | 2 | 2 | High |
| Pradeep et al. 25 | 0 | 2 | 2 | 1 | 2 | 2 | High |
| Graziani et al. 18 | 2 | 2 | 2 | 1 | 2 | 2 | Low |
| Lane et al. 26 | 0 | 0 | 2 | 1 | 1 | 2 | High |
| Rocha et al. 27 | 0 | 0 | 2 | 1 | 1 | 2 | High |
| Rocha et al. 28 | 0 | 0 | 2 | 1 | 1 | 2 | High |