Table 2 Quality assessment of studies
Author (location, year) | Sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective outcome reporting | Other potential threats to validity |
|---|---|---|---|---|---|---|---|
Zuniga (Mexico, 2018) | L | U | H | U | L | L | U |
Roshan (Iran, 2018) | L | L | L | U | L | L | U |
Shahmohammadi (Iran, 2017) | L | U | H | U | L | H | U |
Soga (Japan, 2013) | U | U | U | U | L | H | U |
Wong (Australia, 2014) | U | U | U | U | L | H | U |
Haidari (Iran, 2017) | L | U | U | U | L | H | U |