PEPD and diabetes mellitus: Similarly, mean prolidase activity was lower among diabetic acute MI subjects compared with both diabetic and non-diabetic stable CAD subjects at both the acute and quiescent time points [p < 0.05 as evident from non-overlapping 95% CI of the mean (Table 5) and diabetes effect p < 0.0001; MI × diabetes p = 0.02 (Figure 3)].