| NAI | neuraminidase inhibitors |
| RCTs | randomized controlled trials |
| OSs | observational studies |
| GRADE | Grading of Recommendations, Assessments, Development, and Evaluations |
| RoB 2.0 | cochrane risk-of-bias assessment tool 2.0 |
| ROBINS | risk of bias in non-randomized studies of interventionsg |
| MD | difference in meanss |
| RR | risk ratio |
| CI | confidence interval |
| AE | adverse events |
| SAE | serious adverse events |