Validity of a Diagnostic Scale for Acupuncture: Application of the Item Response Theory to the Five Viscera Score

<table>Graphic representation of Q1 of the Five Viscera Score by Item Response Theory. It shows a chart for understanding item discrimination and item difficulty of IRT. The slope of the curves represents item discrimination, and <i><i>θ</i></i> in the point of intersection of the curves represents item difficulty.</table>

Evidence-Based Complementary and Alternative Medicine

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Figure 1

Figure 1: Validity of a Diagnostic Scale for Acupuncture: Application of the Item Response Theory to the Five Viscera Score 