| AR | allergic rhinitis |
| INCS | intranasal corticosteroid |
| AH | antihistamine |
| LTRA | leukotriene receptor antagonist |
| DM | diabetes mellitus |
| MI | myocardial infarction |
| CCI | Charlson’s comorbidity index |
| CI | confidence interval |
| HR | hazard ratio |
| OR | odds ratio |
| COVID-19 | coronavirus disease-2019 |
| ICS | inhaled corticosteroid |
| ACE2 | angiotensin-converting enzyme |
| TMPRSS2 | transmembrane serine protease 2 |
| NHIS | National Health Insurance Service |
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