1. Society of Thoracic Surgeons 2008 cardiac risk models predict in-hospital mortality of heart valve surgery in a Chinese population: A multicenter study 
Lv Wang, MD, Fang-Lin Lu, MD, PhD, Chong Wang, MD, PhD, Meng-Wei Tan, MD, PhD, Zhi-yun Xu, MD, PhD 
The Journal of Thoracic and Cardiovascular Surgery 
Volume 148, Issue 6, Pages (December 2014)
DOI: /j.jtcvs
Copyright © 2014 The American Association for Thoracic Surgery Terms and Conditions

2. Figure 1
Receiver operating characteristic curve of STS 2008 models for valve surgery: all patients, 0.712; single valve surgery group, 0.734; multiple valve surgery group,
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2014 The American Association for Thoracic Surgery Terms and Conditions

3. Figure 2
Calibration plots of STS 2008 risk models: The calibration plots of STS 2008 for the single valve surgery group were closer to a straight line that exceeds 45° than calibration plots for all patients and the multiple valve group.
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2014 The American Association for Thoracic Surgery Terms and Conditions

4. Figure 3
Clinical performance of STS 2008 models for patient subgroups according to mortality risk. CI, Confidence interval; STS, Society of Thoracic Surgeons.
The Journal of Thoracic and Cardiovascular Surgery  , DOI: ( /j.jtcvs )
Copyright © 2014 The American Association for Thoracic Surgery Terms and Conditions