Table 4 Quality assessment of cohort studies
First authors | Year | Country | Study type | Selection | Comparability | Outcome | Total score | Quality | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A | B | C | D | E | F | J | H | ||||||
Shapiro | 2015 | Canada | Cohort study | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 | Moderate |
Ashley-Martin | 2018 | Canada | Cohort study | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 | Moderate |
Xia | 2018 | China | Cohort study | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 | High |
Wang | 2019 | China | Cohort study | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 6 | Moderate |
Wang | 2020 | China | Cohort study | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 7 | High |