Table 2.
Quality assessment of the studies.
| Study | Random Sequence Generation | Allocation Concealment | Blinding of Participants and Personnel | Blinding of Outcome Assessment | Incomplete Outcome Data | Selective Outcome Reporting | Other Sources of Bias |
|---|---|---|---|---|---|---|---|
| Mousavi et al. (2013) | U | H | H | U | L | L | U |
| Lasaite et al. (2014) |
U | L | L | U | L | L | L |
| Spadiene et al. (2014) | U | L | L | U | L | L | L |
| Jówkoa et al. (2011) |
U | L | L | U | U | L | U |
| Sadowska-Krępa et al. (2019) |
U | L | H | U | L | L | U |
| Bogdanski et al. (2012) | U | L | L | U | L | L | L |
| Hadi et al. (2016) |
U | L | L | U | L | L | L |
| Mozaffari-Khosravi et al. (2014) |
U | H | U | U | U | L | U |
| Azizbeigi et al. (2019) | U | U | H | U | U | L | U |
| Ribeiro Vaza et al. (2018) |
U | L | L | U | H | L | L |
| Suliburska et al. (2012) | L | L | L | L | L | L | L |
| Kuo et al. (2014) |
U | L | L | L | L | L | L |
| Soeizi et al. (2017) | L | L | L | L | L | L | L |
| Venkatakrishnan et al. (2018) | U | L | L | U | L | L | L |
| Sobhani et al. (2020) |
U | L | L | U | L | L | U |
| Bazyar et al. (2020) |
U | L | L | U | L | L | L |
Abbreviations: U; unclear risk of bias, L; low risk of bias, H; high risk of bias.