Scores for the pneumonia severity index (PSI); CURB65 (confusion, urea, respiration, blood pressure; age>65 years); Infectious Disease Society of America (IDSA) and American Thoracic Society (ATS) guidelines for severe CAP; Acute Physiology, Chronic Health Evaluation (APACHE) II; Sequential Organ Failure Assessment (SOFA); and quick SOFA (qSOFA) were calculated.