Figure 1

Comparison of hospital risk-adjusted PSI rates based on the standard PSI algorithm versus modified PSI algorithm. standard PSI algorithm – does not use information from the POA field to distinguish pre-existing conditions from complications modified PSI algorithm uses information from the POA field to distinguish between pre-existing conditions and complications identity line is a 45-degree line which corresponds to perfect agreement for risk-adjusted PSI rates based on the 'standard' and 'modified' PSI algorithms.