| CAP | Community-acquired pneumonia |
| ICU | Intensive care unit |
| COPD | Chronic obstructive pulmonary disease |
| ICD-9-CM | 9th Revision Clinical Modification of the International Classification of Diseases |
| ICD-10-CM | 10th Revision Clinical Modification of the International Classification of Diseases |
| LOS | Length of stay |
| IMV | Invasive mechanical ventilation |
| OR | Odds ratio |
| CI | Confidence interval |
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