TTGE profiles FDA model. Factorial discriminant analysis (FDA) plot for TTGE profiles from CD patients studied, during both active (○) and inactive (◊) celiac disease, and controls (□). The percentages of variation described by the factorial axes (F1,F2) are shown in the parentheses. Center of gravity for each group is reported as filled symbol. Mahalanobis distances (D2), between the three centers of gravity were: active vs inactive = 93.030; active vs control = 551.840; inactive vs control = 290.021. Comparison of the aforementioned distances was statistically significant (Mann-Whitney and Wilcoxon tests, P < 0.0001) between the three groups of patients. The predictability of the model is 100%.