TABLE 4.
Newcastle–Ottawa quality assessment of observational studies
| First author, year | Study design | Selection | Comparability | Outcome | Total score | Result |
|---|---|---|---|---|---|---|
| Annweiler C et al. 21 2020 | Cohort | *** | ** | *** | 8 | Good |
| Annweiler G et al. 22 2020 | Cohort | *** | ** | *** | 8 | Good |
| Cangiano B et al. 23 2020 | Cohort | *** | ** | ** | 7 | Good |
| Giannini S et al. 25 2021 | Cohort | *** | ** | *** | 8 | Good |
| Hernandez JL et al. 26 2020 | Case‐control | *** | ** | ** | 7 | Good |
| Tan CW et al. 30 2020 | Cohort | *** | ** | ** | 7 | Good |
Note: ** means the score is 2, *** means the score is 3. All the scores were sum up to get the final score and to conclude the quality of included studies.