Table A1.
Grading of observational studies included in the meta-analysis using the Newcastle Ottawa Score.
| Domain | Arshad 2020 | Di Castelnuovo 2020 | Geleris 2020 | Ip 2020 | Magagnoli 2020 | Mahevas 2020 | Membrillo 2020 | Paccoud 2020 | Rosenberg 2020 | Sibidan 2020 | Singh 2020 | Yu 2020 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Selection | Representativeness/Case Definition | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Selection of non-exposed/cases | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Ascertainment of exposure/selection of controls | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Baseline assessment/definition of controls | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Comparability | Confounders identified | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| Statistical adjustment | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | |
| Outcome/exposure | Outcome/exposure assessment | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
| Follow-up/method for ascertainment of 1exposure | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | |
| A1dequacy of follow-up/non-response rate | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| Total Score | 7 | 9 | 9 | 9 | 9 | 8 | 7 | 9 | 9 | 9 | 9 | 8 |