Penn State Worry Questionnaire (PSWQ)

Abstract

The Penn State Worry Questionnaire (PSWQ) is a widely used 16-item self-report scale designed to measure the severity and pervasiveness of trait worry. Developed by Meyer, Miller, Metzger, and Borkovec in 1990, the PSWQ focuses on chronic, generalized, and uncontrollable worry, which is a hallmark symptom of Generalised Anxiety Disorder (GAD). It is particularly noted for its ability to distinguish patients with GAD from those suffering from other anxiety disorders, making it a critical tool in both clinical assessment and psychological research.

Keywords

Trait worry, generalized anxiety disorder, GAD, worry assessment, psychological scale, psychometrics, self-report questionnaire.

Authors

Thomas J. Meyer, Michael L. Miller, Robert L. Metzger, Thomas D. Borkovec.

Purpose

The primary purpose of the PSWQ is to provide a quantitative, reliable measure of the propensity for chronic, pervasive worry. This instrument moves beyond measuring acute situational anxiety (state anxiety) to assess the stable characteristic of an individual’s tendency to worry (trait worry).

The scale serves dual functions: in research, it acts as a baseline measure of worry severity and an outcome measure for therapeutic efficacy; clinically, it is invaluable for differential diagnosis. Research has consistently demonstrated the PSWQ’s ability to differentiate individuals with GAD, who typically score very highly, from those with specific phobias or other anxiety disorders, such as Obsessive Compulsive Disorder (OCD).

Construct

The psychological construct measured by the PSWQ is trait worry. This construct encompasses the cognitive dimension of pathological anxiety, characterized by a chain of thoughts and images laden with negative affect, which is often perceived as uncontrollable and constant.

The 16 items of the scale are designed to capture the core features of excessive worry, including its intensity, frequency, and the degree of difficulty an individual has in dismissing worrisome thoughts. Higher scores are interpreted as indicative of the excessive and uncontrollable worry pattern central to GAD phenomenology.

Validity

The PSWQ has established strong empirical validity across diverse populations. Initial validation was performed using student samples (Meyer et al., 1990), followed by validation in clinical samples of anxiety disorder patients (Brown, Antony, & Barlow, 1992).

The scale demonstrates excellent discriminant validity, specifically confirming that individuals diagnosed with GAD exhibit significantly higher PSWQ scores compared to individuals diagnosed with other anxiety disorders. Furthermore, the PSWQ shows high convergent validity, evidenced by its strong positive correlation with other established measures of pervasive worry (Gillis, Haaga, & Ford, 1995), confirming that it measures the intended construct of chronic worry.

Reliability

The psychometric properties of the PSWQ reflect high reliability, supporting its use as a consistent measure of trait worry. The scale exhibits high internal consistency, typically reporting Cronbach’s alpha coefficients above 0.90 across various samples, indicating that all 16 items measure a unitary construct.

In addition to internal consistency, the PSWQ demonstrates good test-retest reliability over periods ranging from several weeks to months. This temporal stability is crucial for a trait measure, assuring that the scores are reliable indicators of an enduring characteristic rather than temporary emotional fluctuations.

Factor Analysis

The PSWQ is primarily conceptualized and scored as a unidimensional measure of worry proneness. Early factor analyses supported a robust single-factor structure, emphasizing the global nature of trait worry across the items.

However, some subsequent analyses have suggested potential sub-factors, sometimes differentiating between items related to the intensity or uncontrollability of worry versus items reflecting the absence of worry. Despite these minor variations in factor structure across studies, the total raw score remains the standard and most reliable metric for assessing overall worry severity in both research and clinical practice.

Instrument

Test Type: Self-report psychological scale.

Format: 16 items utilizing a 5-point Likert scale (ranging from 1, Not at all typical of me, to 5, Very typical of me).

Language Available: English (original); widely translated and validated in many other languages globally.

Population Group: General population, students, and clinical samples (specifically those with anxiety disorders).

Age Group: Adolescents and Adults.

Population Details: The PSWQ has established normative data allowing for conversion of total raw scores into percentiles based on three key samples: an adult community sample (n = 244), a social anxiety disorder sample (n = 132), and a GAD clinical sample (n = 28).

Test Methodology: The scale yields a total score ranging from 16 to 80. Five items (1, 3, 8, 10, 11) are reverse-scored. Higher cumulative scores indicate higher levels of pathological trait worry, with scores typically interpreted against established clinical cutoffs and percentile norms.

Keywords

Worry scale, GAD assessment, trait anxiety, psychometric instrument, psychological diagnosis, self-report measure.

Authors

Author ORCID Identifier: N/A (Information not provided in source).

Affiliation Email addresses: N/A (Information not provided in source).

Correspondence Address: N/A (Information not provided in source).

Permissions & Fee and Test Year

The PSWQ was developed and published in 1990. As a widely utilized academic instrument, it is often available for non-commercial research and clinical use without explicit fees, although users should always refer to the original publication source (Behavior Research and Therapy, Elsevier) or the authors for formal permission protocols.

Reference’s

Brown, T. A., Antony, M. M., & Barlow, D. H. (1992). Psychometric properties of the penn state worry questionnaire in a clinical anxiety disorders sample. Behaviour Research and Therapy, 30(1), 33-37. doi:10.1016/0005-7967(92)90093-V.

Gillis, M.M., Haaga, D.A. and Ford, G.T. (1995) Normative values for the Beck Anxiety Inventory, Fear Questionnaire, Penn State Worry Questionnaire, and Social Phobia and Anxiety Inventory. Psychological Assessment, 7, 450-455.

Meyer, T. J., Miller, M. L., Metzger, R. L., & Borkovec, T. D. (1990). Development and validation of the penn state worry questionnaire. Behavior Research and Therapy, 28, 487-495.

Turk, Fresco, Mennin & Heimberg (2001), Using The Penn State Worry Questionnaire To Distinguish Individuals With Generalized Anxiety Disorder From Individuals With Social Anxiety Disorder. Poster presentation at the Annual Meeting of the Association for Advancement of Behavior Therapy, Philadelphia, PA. The original PDF can be downloaded here: http://www.personal.kent.edu/~dfresco/Fresco_Papers/turk.GAD_PSWQ_ROC_AABT.pdf

Items of the Penn State Worry Questionnaire (PSWQ)

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

Instructions:

Choose the response that best describes how typical or characteristic each item is of you.