Table 4 Quality evaluation of randomised controlled trials
Randomised controlled studies | ||||||
|---|---|---|---|---|---|---|
Items | Hellberg [26] (2019) | Liang [27] (2016) | Aoike [28] (2017) | Leehey [29] (2016) | Hiraki [30] (2017) | Leehey [31] (2009) |
1 | Low | Low | Low | Low | Low | Low |
2 | Low | High | Unclear | Unclear | Unclear | Unclear |
3 | Low | High | Unclear | High | High | High |
4 | Low | Unclear | Unclear | Low | Low | Unclear |
5 | Low | Low | Low | Low | Low | High |
6 | Low | Low | Low | Low | Low | Low |
7 | Low | Low | Low | High | Low | High |