Comparison of severity scoring systems A-DROP and CURB-65 for community-acquired pneumonia

Respirology. 2008 Sep;13(5):731-5. doi: 10.1111/j.1440-1843.2008.01329.x.


Background and objective: The initial assessment of the severity of community-acquired pneumonia (CAP) is important for patient management. The Japanese Respiratory Society (JRS) has proposed a 6-point scale (0-5) to assess the clinical severity of CAP. The A-DROP scoring system assesses the following parameters: (i) Age (male >or= 70 years, female >or= 75 years); (ii) Dehydration (blood urea nitrogen (BUN) >or= 210 mg/L); (iii) Respiratory failure (SaO(2) <or= 90% or PaO(2) <or= 60 mm Hg); (iv) Orientation disturbance (confusion); and (v) low blood Pressure (systolic blood pressure <or= 90 mm Hg). A-DROP is a modified version of CURB-65 (confusion, BUN > 7 mmol/L (200 mg/L), respiratory rate >or= 30/min, low blood pressure (diastolic <or= 60 mm Hg or systolic < 90 mm Hg, and age >or= 65 years) proposed by the British Thoracic Society. However, validation of A-DROP has not been attempted nor has it been compared with CURB-65. The aim of this study was to confirm that A-DROP is equivalent to CURB-65 for predicting severity of CAP.

Methods: A retrospective observational study was conducted of patients with CAP hospitalized at a single centre between November 2005 and January 2007. The 30-day mortality after admission was compared following assessment of severity using the A-DROP and CURB-65 scoring systems.

Results: Three-hundred and twenty-nine patients were evaluated. The areas under the receiver operating characteristic curves were 0.846 (95% confidence interval (CI): 0.790-0.903) and 0.835 (95% CI: 0.763-0.908) for A-DROP and CURB-65, respectively.

Conclusion: The JRS A-DROP can be used to assess severity of CAP, and gives similar results to CURB-65.

Publication types

  • Comparative Study
  • Validation Study

MeSH terms

  • Age Factors
  • Community-Acquired Infections / diagnosis*
  • Community-Acquired Infections / physiopathology
  • Community-Acquired Infections / psychology
  • Confusion / physiopathology
  • Dehydration / physiopathology
  • Humans
  • Hypotension / physiopathology
  • Japan
  • Pneumonia / diagnosis*
  • Pneumonia / physiopathology
  • Pneumonia / psychology
  • Research Design*
  • Respiratory Insufficiency / physiopathology
  • Retrospective Studies
  • Severity of Illness Index*
  • Societies, Medical
  • United Kingdom