Conclusions P-POSSUM was the most accurate model for predicting post-operative mortality after colorectal cancer surgery .
The original POSSUM model was accurate in predicting post-operative complications
Introduction The Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity  ( POSSUM ) model and its Portsmouth ( P-POSSUM ) and colorectal ( CR-POSSUM ) modifications are used extensively to predict and audit post-operative mortality and morbidity .
This aim of this systematic review was to assess the predictive value of the POSSUM models in colorectal cancer surgery .
Risk‐adjusted analysis of surgeon performance: A 1‐year study
A 1‐year prospect i ve analysis was undertaken of all non‐day‐case general surgery in a district general hospital . Using the  Physiological and Operative Severity Score for the en Umeration of Mortality and Morbidity  ( POSSUM ) scoring system 3004 patients were assessed . From the predictions of mortality and morbidity so obtained , a quality measure , the ratio of observed to expected numbers of deaths and complications ( O : E ratio ) was determined for each surgeon , both overall and within specialty zones . The present study demonstrates the serious hazard in using ‘ raw ’ uncorrected mortality and morbidity statistics to compare surgeon performance . Mortality rates varied from 1·0 to 4·9 per cent whereas O : E ratios ranged from 0·83 to 1·06 ; morbidity rates varied from 5·3 to 12·6 per cent with O : E ratios 0·86‐1·02 . Great misunderst and ing may result from the publication of surgeon or hospital ‘ league tables ’ . The present study demonstrates a technique that might allow surgeon performance to be monitored adequately and accurately
Conclusions P-POSSUM was the most accurate model for predicting post-operative mortality after colorectal cancer surgery .
The original POSSUM model was accurate in predicting post-operative complications
Introduction The Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity  ( POSSUM ) model and its Portsmouth ( P-POSSUM ) and colorectal ( CR-POSSUM ) modifications are used extensively to predict and audit post-operative mortality and morbidity .
This aim of this systematic review was to assess the predictive value of the POSSUM models in colorectal cancer surgery .