title: Predictive value of severity scoring systems: comparison of four models in Tunisian adult intensive care units.
abstract: OBJECTIVE
  To compare the performance of four severity scoring systems: the Acute Physiology and Chronic Health Evaluation (APACHE) II, the new versions of the Mortality Prediction Model (MPM0 and MPM24), and the Simplified Acute Physiology Score (SAPS) II.
  
  
  METHODS
  A prospective cohort study.
  
  
  METHODS
  Three Tunisian intensive care units (ICUs).
  
  
  METHODS
  Consecutive, unselected adult patients (n = 1325).
  
  
  METHODS
  None.
  
  
  RESULTS
  Overall, observed death rates were higher than predicted by all models except MPM0. All the evaluated scoring systems had good discrimination power as expressed by area under the receiver operating characteristics curve, but their calibration was less perfect when compared with original validation reports. There were no major differences between the models with regard either to discrimination or calibration performance.
  
  
  CONCLUSIONS
  Despite an overall good discrimination, APACHE II, MPM0, MPM24, and SAPS II showed a less satisfactory calibration in our Tunisian sample of ICU patients. Part of the models inaccuracy could be related to quality of care problems in our ICUs, but this issue needs further analysis.
authors.affiliation: Service de Réanimation Polyvalente, University Hospital of Monastir, Tunisia.
authors.forename: S
authors.initials: S
authors.lastname: Nouira
authors.forename: M
authors.initials: M
authors.lastname: Belghith
authors.forename: S
authors.initials: S
authors.lastname: Elatrous
authors.forename: M
authors.initials: M
authors.lastname: Jaafoura
authors.forename: M
authors.initials: M
authors.lastname: Ellouzi
authors.forename: R
authors.initials: R
authors.lastname: Boujdaria
authors.forename: M
authors.initials: M
authors.lastname: Gahbiche
authors.forename: S
authors.initials: S
authors.lastname: Bouchoucha
authors.forename: F
authors.initials: F
authors.lastname: Abroug
mesh_terms: D018806:APACHE; D000328:Adult; D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D007362:Intensive Care Units; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D012720:Severity of Illness Index; D016019:Survival Analysis; D014416:Tunisia