| Study | PMID | Sequence generation | Baseline characteristics | Allocation concealment | Random housing | Researchers blinding | Random outcome assessment | Outcome assessors blinding | Complete outcome data | Outcome reporting | Other source of bias |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Ezquer, 2008 | 18,489,988 | Yes | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
2 | Ezquer, 2008 | 19,822,294 | Yes | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
3 | Zhou, 2009 | 19,951,572 | Unclear | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
4 | Zhou, 2009 | 20,067,112 | Yes | Unclear | Unclear | Unclear | No | Unclear | Unclear | Unclear | Yes | Yes |
5 | Fang, 2012 | 22,552,764 | Yes | Unclear | Unclear | Yes | No | Unclear | Unclear | Unclear | Yes | Yes |
6 | Park, 2012 | 22,564,642 | Yes | Unclear | Unclear | Unclear | No | Unclear | Unclear | Unclear | Yes | Yes |
7 | Park, 2012 | 23,026,513 | Yes | Unclear | Unclear | Yes | No | Unclear | Unclear | Unclear | Yes | Yes |
8 | Wang, 2013 | 23,295,166 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
9 | Zhang, 2013 | 23,762,850 | Yes | Yes | Unclear | Yes | No | Unclear | Unclear | Unclear | Yes | Yes |
10 | Lv, 2013 | 23,791,972 | Yes | Yes | Unclear | Yes | No | Unclear | Unclear | Unclear | Yes | Yes |
11 | Lv, 2013 | 24,513,119 | Unclear | Unclear | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
12 | Abdel Aziz, 2014 | 24,606,996 | Unclear | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
13 | Lv, 2015 | 24,845,071 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
14 | Lang, 2016 | 27,018,336 | Yes | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes | Yes |
15 | Nagaishi, 2016 | 27,721,418 | No | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
16 | Nagaishi, 2016 | 27,721,418 | No | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
17 | Hamza, 2016 | 27,774,826 | No | Unclear | Unclear | Unclear | No | Unclear | Unclear | Unclear | Yes | Yes |
18 | Nagaishi, 2016 | 28,814,814 | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
19 | Nagaishi, 2016 | 28,814,814 | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
20 | Nagaishi, 2016 | 28,814,814 | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
21 | Rashed, 2018 | 29,425,466 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
22 | Li, 2018 | 29,484,379 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
23 | Bai, 2019 | 31,023,998 | Yes | Yes | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes | Yes |
24 | Xian, 2019 | 31,150,720 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
25 | Cai, 2019 | 31,190,436 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
26 | Lee, 2019 | 31,285,429 | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | No | Yes |
27 | Takemura, 2019 | 31,622,047 | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
28 | Takemura, 2019 | 31,622,047 | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
29 | Yu, 2019 | 31,747,961 | Yes | Yes | Unclear | Yes | Yes | Unclear | Unclear | Unclear | Yes | Yes |
30 | An, 2019 | 31,791,397 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Yes | Yes | Yes |
31 | Rao, 2019 | 31,871,464 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |
32 | Rao, 2019 | 31,871,464 | Yes | Yes | Unclear | Yes | Unclear | Unclear | Unclear | Unclear | Yes | Yes |