Fig. 2

The item characteristic curve (ICC; grey curve) representing expected item responses (y-axis) at various levels of dysautonomia (x-axis) for item 22 (“sexual arousal problems”). Black dots are empirical item responses by subgroups of persons with various levels of dysautonomia (markers on the x-axis) and illustrates an underdiscriminating response pattern. When divided by gender (men = red curves/markers, women = blue curves/markers) it is seen that despite increasing levels of dysautonomia (SCOPA-AUT total scores), women tend to have unchanged or decreasing problems with “sexual arousal” while the plot for men follow the expected ICC