The CUSUM Slope Equals Observed Minus Expected Mortality and Can Be Visualized by a "Slope-Meter".

Publication Title

The Annals of thoracic surgery

Authors

Ruyun Jin, Center for Cardiovascular Analytics, Research, and Data Science; Providence St Joseph Heart Institute, Portland, ORFollow
Mansen Wang, Medical Data Research Center, Providence Health and Services, Portland, OR, USAFollow
Lian Wang, Medical Data Research Center, Providence Health and Services, Portland, OR, USAFollow
Gary Grunkemeier, ProvidenceFollow

Document Type

Article

Publication Date

5-30-2022

Keywords

oregon; portland; cards; cards publication

Abstract

We present an additional advantage of the Risk-Adjusted CUSUM (RA-CUSUM), namely that its slope can be quantified and is in fact equivalent to Observed (O) minus Expected (E) mortality. That is, the height of the RA-CUSUM is the O minus E deaths, which measures performance since the start of the series, and the slope of the RA-CUSUM is the O minus E mortality which measures performance during a chosen interval. We present a useful graphical tool (slope-meter) to allow approximation of this mortality difference by the viewer.

Area of Special Interest

Cardiovascular (Heart)

Specialty/Research Institute

Cardiology

Specialty/Research Institute

Surgery