Panic Disorder Severity Scale (PDSS)

Abstract

The Panic Disorder Severity Scale (PDSS) is a widely used, brief, self-report instrument designed to quantify the severity of panic disorder symptoms according to the criteria established in the DSM-IV. It comprises seven items, each scored on a 5-point scale (0–4), and is intended for use after a formal clinical diagnosis has been established. The PDSS offers a comprehensive profile of symptom severity, assessing core domains such as panic frequency, distress experienced during attacks, anticipatory anxiety, and various forms of phobic avoidance.

Its brevity, requiring only 5 to 10 minutes for administration, makes it an excellent monitoring tool highly sensitive to therapeutic change. The resulting raw scores range from 0 to 28, with a composite score range of 0 to 4. While not a diagnostic instrument, a raw score of 9 or above strongly suggests the need for a formal diagnostic assessment.

Keywords

Panic Disorder Severity Scale, PDSS, Panic disorder, anxiety, severity assessment, self-report, anticipatory anxiety, agoraphobia, psychological measurement.

Authors

Shear, M.K., Brown, T.A., Barlow, D.H., Money, R., Sholomskas, D.E., Woods, S.W., Gorman, J.M., Papp, L.A.

[quads id=5]

Purpose

The primary purpose of the PDSS is to provide operationalized and quantifiable ratings of the core symptom dimensions associated with panic disorder. It serves as a crucial tool for establishing a baseline severity level for patients who have already received a formal diagnosis, offering a detailed profile of their current clinical status.

The scale is particularly valued in clinical trials and treatment monitoring. Because it is brief and demonstrably sensitive to change, clinicians can utilize the PDSS repeatedly to track the efficacy of psychological or pharmacological interventions over time, offering a clear, objective measure of symptom improvement or deterioration across specific domains.

Construct

The PDSS is designed to measure the multidimensional construct of panic disorder severity. It operationalizes this severity across seven distinct, clinically relevant domains, providing a granular assessment of how the disorder impacts an individual’s life.

These domains include the frequency of panic and limited symptom attacks, the level of distress experienced during these attacks, panic-focused anticipatory anxiety (worry about future attacks), phobic avoidance of situations (agoraphobia), phobic avoidance of physical sensations, and the resulting functional impairment in both work/home responsibilities and social functioning. Each domain contributes equally to the overall severity score.

Validity

The validity of the PDSS total score has been established through correlations with established clinical measures. The total PDSS score demonstrated moderate correlation (r = 0.54) with severity ratings derived from the Anxiety Disorders Interview Schedule—Revised (ADIS-R) and a moderate correlation (r = 0.66) with the Clinical Global Impression (CGI) Scale severity ratings.

Furthermore, individual PDSS item scores showed strong associations with ADIS-R items measuring similar content (r ranging from 0.60 to 0.78). Specifically, high correlations were observed for panic frequency (r = 0.71), anticipatory anxiety (r = 0.78), agoraphobic fear and avoidance (r = 0.73), and sensation fear and avoidance (r = 0.69). Importantly, the PDSS total score showed negligible correlation (r = 0.11) with the Hamilton Rating Scale for Depression (Ham-D), supporting the scale’s discriminant validity from major depressive symptoms.

Reliability

The reliability of the PDSS has been assessed through both internal consistency and inter-rater reliability measures. In an evaluation involving 198 patients diagnosed with DSM-III-R panic disorder, the scale yielded an internal consistency measure, Cronbach’s alpha, of 0.64. While this figure suggests acceptable consistency, it indicates that the scale measures a set of related but distinct constructs, aligning with its multidimensional nature.

When administered by trained professionals, the joint reliability (inter-rater reliability) of the scale was found to be strong, ranging from 0.84 to 0.88. This high level of agreement ensures that the scale provides consistent scores regardless of which trained rater administers or scores the instrument, making it highly reliable for clinical assessment.

Factor Analysis

Formal factor analysis details regarding the precise underlying factor structure of the seven items were not explicitly detailed in the primary source material. However, the scale is conceptually structured to capture seven distinct, yet related, dimensions of panic pathology.

The strong empirical correlation of individual items with specific clinical domains (e.g., anticipatory anxiety, phobic avoidance) suggests that the scale successfully represents the core components of panic disorder severity as defined by the DSM-IV criteria.

Instrument

Test Type: Self-report scale (A clinician-administered version also exists)

Format: Seven items, each rated on a 5-point ordinal scale (0 to 4).

Language Available: Primarily English, but widely translated for clinical and research purposes.

Population Group: Clinical populations diagnosed with Panic Disorder (PD) or Panic Disorder with Agoraphobia (PDA).

Age Group: Adults.

Population Details: Developed and tested on patients diagnosed with DSM-III-R and DSM-IV panic disorder.

Test Methodology: Items are scored 0 to 4. Raw scores are summed (Range 0–28), and a composite score (Range 0–4) is established by averaging the seven item scores. Higher scores indicate higher severity.

Keywords

Clinical severity, assessment tool, panic attacks, anticipatory worry, functional impairment, psychometrics, agoraphobia.

[quads id=5]

Authors

Author ORCID Identifier: Not provided in source documentation.

Affiliation Email addresses: Not provided in source documentation.

Correspondence Address: Not provided in source documentation.

Permissions & Fee and Test Year

Test Year: 1997 (Based on the primary development publication).

Permissions and Fee: The scale is frequently used in clinical and research settings. While often available, specific usage agreements, licensing, and potential fees may apply depending on the version (clinician-administered vs. self-report) and the intended context of use. Users should consult the primary authors or copyright holders for current licensing information.

Reference’s

• Shear MK, Brown TA, Barlow DH, Money R, Sholomskas DE, Woods SW, Gorman JM, Papp LA. Multicenter collaborative Panic Disorder Severity Scale. American Journal of Psychiatry 1997;154:1571-1575.
• Houck, P. R., Spiegel, D. A., Shear, M. K., & Rucci, P. (2002). Reliability of the self-report version of the panic disorder severity scale. Depression and Anxiety, 15(4), 183-185.
• Wuyek LA, Antony MM, McCabe RE. Psychometric properties of the panic disorder severity scale: clinician administered and self report versions. Clinical Psychology & Psychotherapy. 2011;18(3):234-243.

[quads id=5]

Items of the Panic Disorder Severity Scale (PDSS)

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

Several of the following questions refer to panic attacks and limited symptom attacks. For this questionnaire we define a panic attack as a sudden rush of fear or discomfort accompanied by at least 4 of the symptoms listed below. In order to qualify as a sudden rush, the symptoms must peak within 10 minutes. Episodes like panic attacks but having fewer than 4 of the listed symptoms are called limited symptom attacks. Here are the symptoms to count:

Rapid or pounding heartbeat, Chest pain or discomfort, Chills or hot flushes, Sweating, Nausea, Trembling or shaking, Dizziness or faintness, Fear of losing control or going crazy, Breathlessness, Feelings of unreality, Fear of dying, Feeling of choking, Numbness or tingling.