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| Studies | Sequence generation | Allocation concealment | Blinding | Incomplete outcome data | Selective outcome reporting |
|---|---|---|---|---|---|
| Xie 2015 | Unclear | Opaque sealed envelopes | Yes | Yes | Unclear |
| Wu 2016 | Unclear | Sealed envelopes | Unclear | Yes | Unclear |
| Zeng 2016 | A computer-generated randomization list | Unclear | Yes | Yes | Unclear |
| Zhang 2015 | A random number table | Unclear | Unclear | Yes | Unclear |
| Sun 2016 | A random number table | Unclear | Unclear | Yes | Unclear |
