Table 2.
Risk of bias (ROB).
| No. | Reference/Year/Country/Sponsorship | Random Sequence Generation (Selection Bias) | Allocation Concealment (Selection Bias) | Blinding of Participants and Personnel (Performance Bias) | Blinding of Outcome Assessment (Detection Bias) | Incomplete Outcome Data Addressed (Attrition Bias) | Selective Reporting (Reporting Bias) | Other Bias | No. of Low ROB Assessments |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Saraf- Bank/2019/Iran/Academia | L | L | L | ? | L | L | ? | 5 |
| 2 | Alizadeh/2017/Iran/Academia | L | L | L | ? | L | L | ? | 5 |
| 3 | Ghazimoradi/2017/Iran/Academia | L | L | ? | ? | L | L | ? | 4 |
| 4 | Nasseri/2017/Iran/Academia | H | H | ? | ? | L | L | ? | 2 |
L—low risk of bias; H—high risk of bias; ?—unclear risk of bias.