Figure 3.

Receiver Operating Characteristic (ROC) curves discriminating horses with a constant Left Forelimb (LF) lameness from sound horses; and discriminating horses with a constant Right Forelimb (RF) lameness from sound horses, plotted for both reins on a circle. Tested Asymmetry Indices were AI-min (blue), AI-max (red), AI-up (grey) and AI-Tmax (orange). The highest specificity and sensitivity point of each curve is represented by a circle (top-left method). The black line is the hypothesized ROC curve with discriminative power only due to chance.