Table 2 Quality assessment
Key | Failure to develop and apply appropriate eligibility criteria (inclusion of control population) | Flawed measurement of both exposure and outcome | Failure to adequately control confounding factors | Incomplete or inadequately short follow-up |
|---|---|---|---|---|
Kim 2017 | Low | Low | High | Unclear |
Shen 2016 | Low | Low | High | Unclear |
Tamayo Isla 2016 | Low | Low | High | High |
Nesrallah 2016 | High | Low | High | Unclear |
Lee 2016 | Low | Low | High | Low |
Marshall 2016 | Low | Low | High | Low |
Wang 2016 | Low | Low | High | Unclear |
Waldum-Grevbo 2015 | Low | Low | High | Low |
Yang 2015 | Low | Low | High | Unclear |
Kim 2015 | Low | High | High | Unclear |
Marshall 2015 | Low | Low | High | Unclear |
Ryu 2015 | Low | Low | High | Unclear |
Marshall 2014 | Low | Low | High | Unclear |
Kim 2014 | Low | Low | High | Unclear |
Heaf 2014 | Low | Low | High | Unclear |
Mircescu 2014 | Low | Low | High | Low |