Table 5 Quality assessment of case-control studies
First authors | Year | Country | Study type | Selection | Comparability | Outcome | Total score | Quality | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A | B | C | D | E | F | J | H | ||||||
Peng | 2015 | China | Retrospective case-control study nested in a cohort | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 | Moderate |
Marie | 2018 | French | Semi-ecological study | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 | Moderate |
Chen | 2021 | America | Case-control study | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 | High |
Jia | 2021 | China | Retrospective case-control study nested in a cohort | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 | High |