ROC curves showing the utility of anal pressures during evacuation and a Valsalva maneuver to discriminating between controls and C-abnormal BET patients in participants with no or one (Panel A) and two or more abnormal rectoanal parameters during evacuation (Panel B). In Panel A, a probability threshold of 54% distinguished between controls and C-abnormal BET patients (area under curve AUC = 0.73, sensitivity = 0.67, specificity = 0.75, P = .0003). By contrast, the ROC curve was not significant in participants with two or more abnormal recto anal parameters.