Studies | Selection | Comparability | Exposure | Total scores (of 9) | |||||
---|---|---|---|---|---|---|---|---|---|
Is the case definition adequate? | Representativeness of the cases | Selection of Controls | Definition of Controls | Comparability of cases and controls on the basis of the design or analysis | Ascertainment of exposure | Same method of ascertainment for cases and controls | Non-Response rate | ||
Bae 2016[16] | ☆ | ☆ | ☆☆ | ☆ | ☆ | ☆ | 7 | ||
Kapetanakis 2018[17] | ☆ | ☆ | ☆☆ | ☆ | ☆ | 6 | |||
Yu 2021[18] | ☆ | ☆ | ☆☆ | ☆ | ☆ | ☆ | 7 | ||
Zhu 2021[19] | ☆ | ☆ | ☆ | ☆ | ☆ | 5 |