PDSS: Panic Disorder Severity Scale

What this assessment is

The Panic Disorder Severity Scale, or PDSS, is a seven-item clinician interview for rating the overall severity of established panic disorder.

M. Katherine Shear and colleagues introduced it in a 1997 multicenter study. The scale combines panic attacks, worry about future attacks, avoidance, and interference with daily life.

This page covers the original clinician-administered PDSS. It does not cover the later PDSS Self-Report version or the separate DSM-5 panic severity measure.

The PDSS rates severity. It is not a stand-alone diagnostic interview.

Who it was designed for

The original study used the PDSS with adults who already had a panic disorder diagnosis and had no more than mild agoraphobia. Trained clinicians completed the ratings.

A later validation study included a broader psychiatric outpatient sample. It supported the scale's reliability and examined a screening decision point, but its result does not replace a diagnostic assessment.

The PDSS can be used with panic disorder with or without agoraphobia. Interpretation changes when agoraphobia is present.

Population and purpose matter.

How it is administered

A clinician uses a scripted interview and rates the previous month. The interview covers seven areas of panic disorder severity.

These areas include attack frequency, distress during attacks, anticipatory anxiety, agoraphobic avoidance, fear of bodily sensations, work interference, and social interference.

Each area receives a rating from 0 to 4. The clinician uses the interview rules, the person's answers, and clinical judgment to select the rating.

The PDSS-SR is different. It is self-completed, commonly refers to the past week, and has its own validation evidence. Do not mix the two names or timeframes.

What it measures

The PDSS measures more than the number of panic attacks. It also records the distress attached to attacks, fear of another attack, avoidance of places or bodily sensations, and effects on work and social life.

That breadth helps explain why attack counts alone can be misleading. One person may have fewer attacks but severe avoidance. Another may have frequent attacks with less disruption between them.

The seven ratings form one overall severity measure. They are not seven diagnoses.

How scoring works

Each rating runs from 0 to 4. Two reporting conventions appear in the research.

The original 1997 paper averaged the seven ratings. That produces a composite from 0 to 4.

Later studies usually add the seven ratings. That produces a total from 0 to 28.

The two forms contain the same information when all seven ratings are present. Multiply an average by seven to obtain the sum. Divide the sum by seven to obtain the average.

Always state the reporting range. A PDSS score of 3 means something very different on a 0-to-4 average and a 0-to-28 sum.

Do not replace a missing rating with zero.

How to interpret a PDSS score

Higher scores indicate greater overall panic-disorder severity.

Do not apply one set of bands to everyone. An interpretation study found different ranges for people with and without agoraphobia. Its participants were adults in panic-disorder treatment trials.

The same study proposed a summed score of 5 or lower for remission and a reduction of at least 40% for response in that research context. These are study-based outcome rules, not instructions for individual treatment.

Use the score with diagnostic status, agoraphobia, functioning, and the pattern across the seven areas.

What the score cannot tell you

The PDSS cannot establish that panic attacks are caused by panic disorder. Medical conditions, medication effects, substance use, trauma, and other anxiety conditions can produce similar experiences.

It cannot decide treatment from a score.

The scale also does not provide a complete safety assessment. A low total does not rule out serious distress or another condition.

Clinical evaluation remains necessary when symptoms are new, severe, or medically unexplained.

Evidence and limitations

The original study found strong agreement between trained raters and evidence that the PDSS changed when patients improved. It also warned that the first sample had limited agoraphobia and did not represent every person with panic disorder.

Later research supported a single overall severity score. At the same time, score interpretation differed by agoraphobia status.

Version labels can cause confusion. Confirm whether a result came from the clinician PDSS, the PDSS-SR, or the separate ten-item DSM-5 measure before interpreting its range or change over time.