The Panic Disorder Severity Scale (PDSS) is a clinical assessment tool for evaluating the severity of symptoms in individuals with panic disorder. It includes seven items that measure the frequency and intensity of panic attacks, anticipatory anxiety, agoraphobic avoidance, and the impact on daily functioning. Respondents rate each item based on their experiences over the past week. The PDSS helps clinicians assess symptom severity, monitor treatment progress, and guide effective treatment planning.