Anxiety Sensitivity / Panic (ASI-3)
The Anxiety Sensitivity Index-3 (Taylor et al.) measures a key construct of anxiety disorders, especially panic: the fear of the bodily and mental sensations of anxiety themselves and of their consequences (not "how much you worry," but "how much you fear anxious sensations"). Three facets: physical concerns (heart racing = heart attack, shortness of breath = I'll suffocate), cognitive (confused thoughts = I'm going crazy), and social (fear that others will notice your nervousness). High sensitivity is the main risk factor for panic.