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International Journal of Behavioral Medicine

, Volume 22, Issue 2, pp 197–205 | Cite as

The German PASS-20 in Patients with Low Back Pain: New Aspects of Convergent, Divergent, and Criterion-Related Validity

  • Nina Kreddig
  • Adina C. Rusu
  • Katja Burkhardt
  • Monika I. Hasenbring
Article

Abstract

Background

The PASS-20 (McCracken and Dhingra, Pain Res Manag 7:45−50, 2002) is a shortened version of the Pain Anxiety Symptoms Scale (PASS), a self-report measure of pain anxiety. The PASS-20 demonstrates good psychometric characteristics but has not yet been validated in a German population.

Purpose

The aims of the present study were to (1) examine the factor structure and psychometric characteristics of the German PASS-20; (2) investigate its construct validity with respect to depression, fear-avoidance, and endurance; and (3) determine its criterion-related validity with a special emphasis on pain, disability, and quality of life.

Method

A principal component analysis was performed on a sample (N = 195) of patients with acute, subacute, and chronic low back pain. Reliability was examined with Cronbach’s α. Validity was assessed by correlating the PASS-20 to measures of depression, anxiety, disability, quality of life, and avoidance-endurance-related behavioral pain responses.

Results

The original four-factor structure proposed for the PASS-20 was replicated using the original subscale labels. The reliability of the total score and the subscales was satisfactory to excellent, and both convergent and divergent validity were moderate to high in the expected directions, showing positive correlations with anxiety, fear, depression, and fear-avoidance and negative correlations with endurance and quality of life. The PASS-20 showed unique predictive ability and advantages over the Tampa Scale of Kinesiophobia.

Conclusions

The results for the German PASS-20 support the original factor structure and provide evidence of satisfactory psychometric characteristics and usefulness in patients with low back pain.

Keywords

Pain anxiety Avoidance Endurance Back pain Assessment Disability Quality of life 

Notes

Acknowledgments

This study was supported by a research grant from the German Research Foundation (DFG: HA 1684) awarded to MIH.

Ethical Standards

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients included in the study.

Conflict of Interest

Authors Kreddig, Burkhardt, Rusu, and Hasenbring declare that they have no conflict of interest.

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Copyright information

© International Society of Behavioral Medicine 2014

Authors and Affiliations

  • Nina Kreddig
    • 1
  • Adina C. Rusu
    • 1
    • 2
  • Katja Burkhardt
    • 1
  • Monika I. Hasenbring
    • 1
  1. 1.Department of Medical Psychology and Medical Sociology, Faculty of MedicineRuhr-University of BochumBochumGermany
  2. 2.Department of PsychologyRoyal Holloway University of LondonEghamUK

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