Table 3 Overall scientific quality of the randomized controlled studies
Study | Yamada et al. 2007 | Toyoizumi et al. 2013 | Ide et al. 2014 |
|---|---|---|---|
Criterion | [19] | [21] | [22] |
Cochrane Collaboration's tool for assessing risk for bias | |||
Random sequence generation | Low | Low | Low |
Allocation concealment | Low | High | High |
Blind participants and personnel | Low | High | High |
Blind outcome assessment | Low | Low | Low |
Incomplete outcome data | Low | Low | Low |
Selective reporting | Low | High | High |
Other bias | Low | Unclear | Unclear |
Jadad score | |||
Randomization (range, 0–2) | 2 | 2 | 2 |
Double blinding (range, 0–2) | 2 | 0 | 0 |
Withdrawals and dropouts (range, 0–1) | 1 | 1 | 1 |
Total score | 5 | 3 | 3 |