How to Calculate Panic Disorder Severity Scale
What is Panic Disorder Severity Scale?
The Panic Disorder Severity Scale (PDSS) Calculator measures the severity of panic disorder across 7 dimensions rated 0-4 each, producing a composite score that tracks symptom intensity, avoidance, and functional impairment.
Formula
PDSS Total Score = Sum of 7 items (each 0-4); Range: 0-28
- TS
- Total PDSS Score (points (0-28)) — Composite severity score across all 7 panic disorder dimensions
- Qi
- Item Score (points (0-4)) — Severity rating for each dimension from none (0) to extreme (4)
- RC
- Reliable Change Index (points) — Minimum score change (5 points) indicating statistically reliable improvement
Step-by-Step Guide
- 1Rate 7 items on a 0-4 scale: panic frequency, distress during panic, anticipatory anxiety, agoraphobic avoidance, interoceptive avoidance, work impairment, social impairment
- 2Each item has specific anchor descriptions for each severity level (0-4)
- 3Sum all 7 items for a total score of 0-28
- 4Severity levels: 0-1 minimal, 2-5 mild, 6-9 mild-moderate, 10-13 moderate, 14+ severe
Worked Examples
Input
Weekly panic attacks (2), moderate distress (2), mild anticipatory anxiety (1), no avoidance (0), mild interoceptive avoidance (1), no work impairment (0), mild social impairment (1)
Result
PDSS score: 7/28 — mild-to-moderate panic disorder severity
Input
Daily panic attacks (4), extreme distress (4), pervasive anticipatory anxiety (3), significant avoidance (3), marked interoceptive avoidance (3), severe work impairment (3), severe social impairment (3)
Result
PDSS score: 23/28 — severe panic disorder requiring intensive treatment
Common Mistakes to Avoid
- ✕Confusing the PDSS (clinician-rated or self-report) with the Panic Attack Severity Scale — they measure different constructs
- ✕Not distinguishing between panic attack frequency and panic disorder severity — the PDSS captures the broader impact beyond attack count
- ✕Failing to assess interoceptive avoidance (avoiding physical sensations like exercise or caffeine) which is a key maintenance factor
Frequently Asked Questions
What is a good treatment response on the PDSS?
A decrease of 40% or more from baseline is generally considered a treatment response. A final score below 5 suggests remission. Most effective treatments (CBT, SSRIs) achieve 50-70% reduction in PDSS scores.
How is the PDSS different from just counting panic attacks?
The PDSS captures the full impact of panic disorder beyond attack frequency, including anticipatory anxiety, avoidance behaviors, and functional impairment — patients can have few attacks but severe avoidance and disability.
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