Table 1.

Summary of Existing Pneumonia Severity Scores^a

Severity Score	Components	Area Under the Receiver Operator Characteristic Curve
PSI [10]	Age, Nursing Home, Comorbidities, AMS, Tachypnea, Hypotension, Hypo- or Hyperthermia, Tachycardia, pH <7.35, BUN ≥30, Na <130, Glucose ≥250, Hematocrit <30%, Partial pressure of arterial oxygen <60 mmHg, Pleural Effusion	30-day Mortality: 0.70–0.89 CAP Complications: 0.58–0.85
CURB-65 [11]	Confusion, Urea ≥7 mmol/L, Tachypnea, Hypotension and Age ≥65	30-day Mortality: 0.73–0.87 CAP Complications: 0.60–0.78
IDSA/ATS 2007 [14]	Minor Criteria: Tachypnea, PaO2/FiO2 ≤250, Multilobar Infiltrates, Confusion, BUN ≥20, WBC ≤4000, Platelets ≤100000, Hypothermia, Hypotension Major Criteria: Invasive Mechanical Ventilation, Need for Vasopressors	30-day Mortality: 0.63–0.67 CAP Complications: 0.85–0.88
SMART-COP [9]	Hypotension, Multilobar Infiltrates, Albumin <3.5 g/dL, Tachypnea, Tachycardia, Confusion, Hypoxemia and Arterial pH <7.35	30-day Mortality: Not assessed CAP Complications: 0.83–0.87
SCAP [12]	Major Criteria: pH <7.30, Hypotension Minor Criteria: Confusion, Urea >30 mg/dL, Tachypnea, Multilobar Infiltrates, Hypoxemia, Age ≥80	30-day Mortality: Not assessed CAP Complications: 0.75–0.83
Williams et al [18] (Pediatric)	AgeR,E, SexE, RaceE, ComorbiditiesR, Household smoke exposure, Season, Symptom Duration, Vomiting/feeding refusal, Hypo/HyperthermiaE, TachypneaR,E, TachycardiaR,E, HypotensionR,E, HypoxemiaR,E, AMSR, Chest IndrawingR, Asymmetric breath sounds, Wheezing, White blood cell countE, Infiltrate PatternR, Pleural EffusionR	Death or CAP Complications: 0.78–0.81
Araya et al [19] (Pediatric)	Age, Comorbidities, Hypoxemia, Hypotension, Bacteremia, Multilobar/Complicated Pneumonia, Kidney/Liver Failure and Acute Respiratory Distress Syndrome	Death: 0.94

Abbreviations: AMS, altered mental status; CAP, community-acquired pneumonia; ^E, components of electronic health record-based variable model; IDSA/ATS, Infectious Diseases Society of America/Amercan Thoracic Society; PSI, pneumonia severity index; ^R, components of reduced variable model; SCAP, severe CAP.

^aTable adapted from Pereira JM, Paiva JA, Rello J. Assessing severity of patients with community-acquired pneumonia. Semin Respir Crit Care Med. 2012;33:272. CAP complications defined as need for intensive care unit admission, need for mechanical ventilation, or need for vasopressor support.