Mortality control charts: Both components of POSSUM ratio require critical analysisBMJ 2003; 326 doi: https://doi.org/10.1136/bmj.326.7403.1397-a (Published 19 June 2003) Cite this as: BMJ 2003;326:1397
- George A Khoury, consultant surgeon (email@example.com)
- Conquest Hospital, East Sussex NHS Trust, St Leonards on Sea, TN37 7RD
EDITOR—Mean mortality of almost 10% and 30% (max 50%) is reported for elective and emergency gastro-oesophageal surgery in 29 units.1 Yet none had underperformed. A benchmark is set even though institutions were not randomised.
A multifactorial model is created by using POSSUM to fit this dataset.2 POSSUM's overpredicting tendency …