| BAL | Bronchoalveolar Lavage |
| BMI | Body Mass Index |
| CRP | C-Reactive Protein |
| CURB-65 | Confusion, Urea, Respiratory rate, Blood pressure, Age ≥65 |
| HAP | Hospital-Acquired Pneumonia |
| ICD-10 | International Classification of Diseases, 10th Revision |
| ICU | Intensive Care Unit |
| IDSA | Infectious Diseases Society of America |
| IQR | Interquartile Range |
| LOS | Length of Stay |
| OR | Odds Ratio |
| PCR | Polymerase Chain Reaction |
| PSI | Pneumonia Severity Index |
| PSM | Propensity Score Matching |
| VAP | Ventilator-Associated Pneumonia. |
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