Table 2. Bias of included studies.
| Author and year of publication | Focal matter | Randomization | Blindfold allocation | Double blind | Losses less<20% | Analysis by intention to treat | Prognostic characteristics | Outcome | Sample calculation | JADAD |
|---|---|---|---|---|---|---|---|---|---|---|
| Uemura et al., 201513 | 2 | |||||||||
| Boyle et al., 200914 | 4 | |||||||||
| Zammit et al., 200815 | 3 | |||||||||
| Hindmarch et al., 200616 | 4 | |||||||||
| Bentué-Ferrer et al., 200317 | 3 | |||||||||
| Fairweather et al., 199218 | 3 |
Green shade: absence of bias; red shade: presence of bias; yellow shade: doubt.