title: Prognostic information in administrative co-morbidity data following coronary artery bypass grafting.
abstract: OBJECTIVE
  The aim of this study was to evaluate the prognostic information obtainable from administrative data with respect to 30-day mortality following coronary artery bypass grafting (CABG) and to compare it with the European System for Cardiac Operative Risk Evaluation (EuroSCORE) recorded in a clinical database.
  
  
  METHODS
  We used a co-morbidity index calculated from administrative data in the Danish National Patient Register by means of all admissions 1 year prior to CABG. In addition, each CABG was categorised as being isolated or not, and acute or not. The prognostic power of the co-morbidity index was compared to that achieved using EuroSCORE from a clinical database comprising information on all patients treated with CABG in Denmark. The outcome was all-cause mortality within 30 days after CABG and the prognostic power was evaluated using logistic regression analyses.
  
  
  RESULTS
  We identified 20078 patients treated with CABG from 2000 to 2007 with a complete registration of the total additive EuroSCORE in the clinical database. The co-morbidity index carried significant prognostic information regarding 30-day mortality (c-statistic 0.81). The prognostic power of the co-morbidity index was equal to that of the EuroSCORE (c-statistic 0.79).
  
  
  CONCLUSIONS
  A standard co-morbidity index based on administrative data as well as on clinical data has proven equally useful for prediction of mortality amongst CABG patients.
authors.affiliation: National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark. stabil@dadlnet.dk
authors.forename: Steen Zabell
authors.initials: SZ
authors.lastname: Abildstrøm
authors.forename: Anders
authors.initials: A
authors.lastname: Hvelplund
authors.forename: Søren
authors.initials: S
authors.lastname: Rasmussen
authors.forename: Per Hostrup
authors.initials: PH
authors.lastname: Nielsen
authors.forename: Poul Erik
authors.initials: PE
authors.lastname: Mortensen
authors.forename: Marie
authors.initials: M
authors.lastname: Kruse
mesh_terms: D000368:Aged; D015897:Comorbidity; D001026:Coronary Artery Bypass / Q000401:mortality*; D016208:Databases, Factual; D003718:Denmark / Q000453:epidemiology; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016896:Treatment Outcome