Psychometric properties of the panic disorder severity scale: clinician‐administered and self‐report versions

Abstract

The Panic Disorder Severity Scale (PDSS) is a seven-item scale designed to assess overall severity of panic disorder symptoms. Although the PDSS is widely used, there have been limited independent studies confirming reliability and validity, particularly of the self-report version of the PDSS, and even fewer studies directly comparing the two versions. Given the need for psychometrically sound measures that comprehensively assess the main features of panic disorder, this study examined the psychometric properties of both the clinician-administered and self-report versions of the PDSS. As the PDSS targets symptom severity across a number of specific domains, PDSS items were compared to several scales designed to measure similar constructs, including the Anxiety Sensitivity Index, Illness Intrusiveness Ratings Scale, Mobility Inventory for Agoraphobia and Agoraphobic Cognitions Questionnaire. Results indicated acceptable reliability for both the clinician-administered and self-report versions. Results indicated acceptable validity for the clinician-administered PDSS and promising validity for the self-report. However, correlations between both versions of the PDSS and comparison measures were lower than predicted. Results also indicated that scores on the self-report and clinician-administered versions were significantly associated, although correlations between specific PDSS items on the two versions were also lower than expected. Results suggest that total scores on each of the PDSS versions provide a useful indication of panic-related severity. However, clinicians and researchers are cautioned against relying on scores from individual items to measure specific constructs due to their poor specificity.

Examination of the relations between obsessive–compulsive symptom dimensions and fear and distress disorder symptoms

“…Items are rated on a 5-point Likerttype scale with higher scores indicating more severe panic symptoms. Prior psychometric research has indicated that the PDSS has good reliability and validity (Shear et al, 1997;Wuyek et al, 2011). The PDSS evidenced excellent internal consistency in the current sample (α ¼0.94).…”

“…The Panic Disorder Severity Scale (PDSS; Shear et al, 1997;Wuyek et al, 2011) was used to assess symptoms of fear. The PDSS is a 7-item self-report questionnaire assessing severity and frequency of panic attacks, associated anxiety/distress, avoidance, and functional impairment.…”

Virtual Reality Exposure Therapy Does Not Provide Any Additional Value in Agoraphobic Patients: A Randomized Controlled Trial

“…(1) Panic Disorder Severity Scale (PDSS), which is a seven-item clinician-administered scale to assess overall panic severity [19,20]. The PDSS was rated before sessions 1, 5 and 10.…”

Panic Disorder: Assessment and Treatment

“…In addition to the clinician-rated measure, a selfreport format of the PDSS (PDSS-SR) is also available. The PDSS-SR was significantly correlated with clinician ratings on the PDSS (correlation = .61; Wuyek, Antony, & McCabe, 2011). This format has also been shown to have good test-retest reliability and is sensitive to change over the course of treatment (Houck, Spiegel, Shear, & Rucci, 2002;Wuyek et al, 2011).…”

“…This format has also been shown to have good test-retest reliability and is sensitive to change over the course of treatment (Houck, Spiegel, Shear, & Rucci, 2002;Wuyek et al, 2011). However, the PDSS-SR was significantly less correlated with other panic-related measures, such as the ACQ and the MI, than the PDSS clinician-rated measure (Wuyek et al, 2011).…”