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Table 3 Risk of bias table based on Scottish Intercollegiate Guidelines Network (SIGN) Criteria for high risk of bias studies; non-randomized trials
| Author, Year | Research Question | Randomization | Concealment | Blinding | Similarity at baseline | Similarity between arms | Outcome measures | Percent drop-out | Intention to treat | Results between sites | Level of evidence |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Barbosa et al., 2014 | Y | N | NA | NA | CS | CS | Y | 0% | Y | NA | 1- |
| Bonci et al., 1990 | N | N | NA | NA | Y | N | CS | 0% | Y | NA | 1- |
| Deutschmann et al., 2011 | Y | N | NA | NA | Y | N | Y | 0% | Y | NA | 1- |
| Lauro et al., 1991 | Y | CS | NA | NA | N | CS | CS | CS | Y | NA | 1- |
| Nansel et al., 1991 | Y | N | NA | NA | CS | CS | Y | 0% | Y | NA | 1- |
