Standard evaluation techniques versus glycemic penalty index (GPI) for patient group 2 and 1 (but considering only the data of the first 48 h in the latter). The results of the standard evaluation methods are plotted against the results of the new proposed assessment tool (GPI). The top panel shows the average morning blood glucose (BG) readings as a function of GPI. The middle panel represents the average BG values versus the GPI values. Finally, the bottom panel illustrates the computed HGI values as a function of GPI. The shaded area contains those patients whose BG profile was evaluated differently: 'clinically acceptable' for the standard measures, 'clinically unacceptable' for GPI. The stars denote the patients from group 1 whereas the diamonds represent the patients from group 2. The correlation coefficients (R) for the existing measures with respect to GPI are depicted in the respective panels.