| ATC-code | Anatomical therapeutic chemical code |
| BE | Non-cystic fibrosis bronchiectasis |
| CI | Confidence interval |
| COPD | Chronic obstructive pulmonary disease |
| CRS | Danish Civil Registration System |
| DNDRP | Danish Database of Reimbursed Prescriptions |
| DNPR | Danish National Patient Register |
| H. influenzae | Haemophilus influenzae |
| HR | Hazard ratio |
| ICD-10 | International classifications of disease 10th revision |
| ICSs | Inhaled corticosteroids |
| IQR | Interquartile range |
| IPTW | Inverse probability-of-treatment weighting |
| LABA | Long-acting β2-agonist |
| LAMA | Long-acting muscarinic antagonist |
| OCSs | Oral corticosteroids |