Table 2 Quality assessment of the studies
Author (year) | Type of study | Factor of downgrade | Factor of escalation | Level of evidence | ||||
|---|---|---|---|---|---|---|---|---|
Risk of bias | Inconsistency | Indirectness | Imprecision | Publication bias | ||||
Elkind-Hirsch. K et al., 2008 [31] | RCT | -1 | 0 | 0 | -1 | 0 | 0 | Low |
Li. R.Y et at 2020 [17] | RCT | -1 | 0 | 0 | 0 | 0 | 0 | Medium |
Li. R et al.,2022 [16] | RCT | -1 | 0 | 0 | 0 | 0 | 0 | Medium |
Liu. X et al.,2017 [18] | RCT | -1 | 0 | 0 | 0 | 0 | 0 | Medium |
Tao. T et al.,2021 [32] | RCT | -1 | 0 | 0 | 0 | 0 | 0 | Medium |
Wang. J et al., 2017 [33] | RCT | -1 | 0 | 0 | -1 | 0 | 0 | Low |
Zheng. S et al.,2017 [10] | RCT | 0 | 0 | 0 | 0 | -1 | 0 | Medium |
Zheng. S et al.,2019 [20] | RCT | 0 | 0 | 0 | -1 | 0 | 0 | Medium |
Ma. R. L et al.,2021 [21] | RCT | -1 | 0 | 0 | 0 | 0 | 0 | Medium |