Figure 2.

Density plot of the theoretical distribution of the healthy cat population. (A) denotes the threshold for dividing healthy and sick cats, the 30th percentile (a HRQL score of 44.8). Above this threshold (to the right of the plot) are 70% of the healthy cat population predicted to be healthy, the area marked by (B). Below the threshold (to the left of the plot) are 30% of the healthy population predicted to be sick, the area marked by (C).