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4. Clinical Performance Indicator explained

Together with our statisticians we have developed a method for monitoring our outcomes using clinical performance indicators. These set the standard of acceptable performance for our surgical practice. How we perform against this standard is shown in the charts.
The mortality rate is the number of deaths expressed as a percentage of the total number of patients treated in a chosen time frame. This is plotted against the horizontal axis of the graph and is shown by the diamond shape:

For example if 100 operations are performed and 2 of these patients died, the average mortality rate would be 2%. We cannot be absolutely sure the mortality rate will always be 2% as it may be higher or lower after the next 100 operations; perhaps 1 death in the next 100 or 4 deaths in the next 100. To allow for this fluctuation we present a range of values between which we can be almost certain that the true rate lies. This range of values is called a confidence interval (1% - 4%).

This confidence interval is shown on the graph as a horizontal line.

Lower boundary  Upper boundary

(At Papworth we use the traditional 95% confidence interval).

The red line        represents the predicted mortality rate for the group of patients, calculated using EuroSCORE.

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