Table 2 Assessment of Methodological Quality of Included Studies.
Study | Random allocation | Hidden distribution | Blind method | Incomplete Outcome Data | Selective reporting of results | Other bias | quality grade |
|---|---|---|---|---|---|---|---|
XM Ceng21 | Random number method | Low | Single-blind | Low | Low | Low | A |
WN Pei22 | Random number method | Low | Single-blind | Low | Low | Low | A |
JZ Lv23 | Random number method | Low | Single-blind | Low | Low | Low | A |
FR Mo24 | mentioned random | Low | Single-blind | Low | Low | Low | A |
XP Wu25 | mentioned random | Low | Single-blind | Low | Low | Low | A |
YH Li26 | mentioned random | Low | Single-blind | Low | Low | Low | A |
Y Zhang27 | mentioned random | Low | Single-blind | Low | Low | Low | A |
HY Han28 | mentioned random | Low | Single-blind | Low | Low | Low | A |
SH Yang29 | Random number method | Low | Single-blind | Low | Low | Low | A |
XC Wang30 | No clear | Low | No clear | Low | Low | Low | B |
Shehata M20 | block randomization | Low | Single-blind | Low | Low | Low | A |
Murakami M19 | mentioned random | Low | Single-blind | Low | Low | Low | A |
Kim S18 | block randomization | Low | Single-blind | Low | Low | Low | A |
Isono T31 | block randomization | Low | Single-blind | Low | Low | Low | A |
Kim J17 | mentioned random | Low | Single-blind | Low | Low | Low | A |
Hwang J16 | mentioned random | Low | Single-blind | Low | Low | Low | A |
