Table 2.
Quality assessment of included studies.
| Selection Bias Domains | Performance Bias | Detection Bias | Attrition Bias | Reporting Bias | ||
|---|---|---|---|---|---|---|
| Study | Random Sequence Generation | Allocation Concealment |
Blinding of Participants and Personnel | Blinding of Outcome Measures | Incomplete Outcome Bias | Selective Reporting |
| Hughes et al. [61] |
? | ? | ? | ? | + | + |
| Blom et al. [62] |
+ | − | + | − | + | + |
| Momeni et al. [63] |
+ | + | + | + | + | + |
| Palta et al. [65] |
? | − | − | ? | + | + |
| Màrquez et al. [66] |
? | ? | ? | ? | − | − |
| Parswani et al. [69] |
+ | ? | ? | ? | + | + |
Notes: “+” = low risk of bias, “-”= high risk of bias, “?” = unclear risk of bias.