Table 1 Risk of bias assessment. *①Random sequence generation (selection bias); ②Allocation concealment (selection bias); ③Blinding of participants and personal (performance bias); ④Blinding of outcome assessment (detection bias); ⑤Incomplete outcome data (attrition bias);⑥Selection reporting (reporting bias); ⑦Other bias
Study | ①* | ②* | ③* | ④* | ⑤* | ⑥* | ⑦* |
|---|---|---|---|---|---|---|---|
Kalem (2020) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Huang (2020) | Low risk | Low risk | Unclear risk | Low risk | Unclear risk | Low risk | Unclear risk |
Scarpellini (2019) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear risk |
Arefi (2018) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Tanha (2016) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Unclear risk |
Aleyasin (2016) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Obidniak (2016) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |
Maryam (2016) | Low risk | Low risk | Unclear risk | Low risk | Unclear risk | Low risk | Unclear risk |
Abedi (2015) | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk | Low risk |