This graph shows the percentage of patients who survived their operation. This is called the ‘in-hospital survival rate’.
Some units do more complicated surgery on patients who are more sick, whilst others do fairly routine surgery. So that we can make fair comparisons between these units, the survival rate has been ‘risk adjusted’ to take into account the difficulty of each operation.
The dot in the graph shows the risk-adjusted survival rate for the unit you are looking at. The area between the two dotted lines is the range in which the dot will appear if the results are as expected.
For more information on understanding mortality rates, look at the Understanding the graphs page
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