1. The easier, the better: Age, creatinine, ejection fraction score for operative mortality risk stratification in a series of 29,659 patients undergoing elective cardiac surgery 
Marco Ranucci, MD, Serenella Castelvecchio, MD, Massimiliano Conte, MD, Gianluigi Megliola, MD, Giuseppe Speziale, MD, Flavio Fiore, MD, Fabio Guarracino, MD, Sabino Scolletta, MD, Ricardo Martinez Escobar, MD, Mauro Falco, MD, Elena Bignami, MD, Giovanni Landoni, MD 
The Journal of Thoracic and Cardiovascular Surgery 
Volume 142, Issue 3, Pages (September 2011)
DOI: /j.jtcvs
Copyright © 2011 The American Association for Thoracic Surgery Terms and Conditions

2. Figure 1
Receiver operating characteristics analysis for the 3 models. ACEF, Age, creatinine, ejection fraction; AUC, area under the curve; CI, confidence interval.
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2011 The American Association for Thoracic Surgery Terms and Conditions

3. Figure 2
Predicted versus observed operative mortality rates for deciles of risk distribution. ACEF, Age, creatinine, ejection fraction; CI, confidence interval; ES, European System for Cardiac Operative Risk Evaluation.
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2011 The American Association for Thoracic Surgery Terms and Conditions