Figure 3: Bland Altman plot for method comparisons. Bland Altman plots are shown for (a) multiple linear regression predicted versus clinical MRTD, and (b) neural network model predicted versus clinical MRTD. Horizontal lines are drawn at the mean difference, and at the limits of agreement. All predicted values were within limits of agreement for both models, althought these limits were more narrow for the neural network model estimates. The plots are useful revealing the relationship between the differences and the averages, the slight deviation from symmetry in the multiple regression indicates some systematic bias but no possible outliers were identified.