title: External validation of Cleveland Clinic Foundation colorectal cancer model in a University Clinic in terms of predicting operative mortality.
abstract: BACKGROUND
  The aim of this study was to perform an external validation of Cleveland Clinic Foundation colorectal cancer model in a single center.
  
  
  METHODS
  Relevant data of 771 patients who underwent surgery for colorectal cancer between January 1997 and November 2008 were retrospectively collected. The performance of the scoring system was evaluated by discrimination and calibration. Discrimination was evaluated by using the area under the receiver operator characteristics curve and calibration by using the Hosmer-Lemeshow goodness-of-fit test.
  
  
  RESULTS
  Mean age was 60.8 (18-91). Forty-four percent of patients were female, and 56% were male. Overall mortality was 3.9%. Cleveland Clinic Foundation colorectal cancer model showed good discrimination but poor calibration.
  
  
  CONCLUSIONS
  These data suggest that the Cleveland Clinic Foundation colorectal cancer model is a suitable model to be used in our center for patients with colorectal cancer but requires recalibration.
authors: Department of General Surgery, Hacettepe University Medical School, 06100, Sihhiye, Ankara, Turkey. ahmetdogrul@yahoo.com
authors: A B
authors: AB
authors: Dogrul
authors: Y A
authors: YA
authors: Kiliç
authors: A E
authors: AE
authors: Celebi
authors: S
authors: S
authors: Celik
authors: G E
authors: GE
authors: Dumlu
authors: E
authors: E
authors: Cetinkaya
authors: I
authors: I
authors: Sayek
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000401:mortality* / Q000601:surgery*; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011379:Prognosis; D012372:ROC Curve; D015203:Reproducibility of Results; D012189:Retrospective Studies; D018570:Risk Assessment; D055815:Young Adult