The NPDA Audit Measures
For a full description of the NPDA audit measures please visit www.rcpch.ac.uk/NPDA
Understanding the Caterpillar Plots
If you choose to view the results for a particular NPDA audit measure via the "Caterpillar" chart type option you will notice that its appearance is quite different to the other views. In the Caterpillar Plots CCG/LHBs are ranked according to performance in the measure, with the most adherent shown on the right hand side of the graph. The performance in the measure (“compliance”) is shown by the vertical axis. Each CCG/LHB is represented by a dot, with a vertical bar above and below the dot representing uncertainty (statistically the “95% confidence interval”) in this measurement of performance.
Although CCG/LHBs are ranked for presentation, the purpose of the plot is to demonstrate the variation rather than to describe differences between CCG/LHBs with statistical confidence. Readers should be therefore use these plots to assert differences between CCG/LHBs only with the utmost of caution.