Table 1.

Comparisons of clinical characteristics among the study population

BUN, blood urea nitrogen; COPD, chronic obstructive pulmonary disease; ICU, intensive care unit; SCAP, severe community-acquired pneumonia; WBC, white blood cell; CURB-65 denotes confusion, blood urea nitrogen ≥ 20 mg/dL, respiratory rate ≥ 30/min, systolic blood pressure (BP) < 90 mmHg or diastolic BP ≤ 60 mmHg, and age ≥ 65 yr; Control group denotes patients with non-SCAP; Minor-SCAP denotes SCAP based on the IDSA/ATS minor criteria.