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The Schwartz Cancer Fatigue Scale: testing reliability and validity

A L Schwartz1

  • 1University of Utah College of Nursing, Salt Lake City, USA.

Oncology Nursing Forum
|May 26, 1998
PubMed
Summary

The Schwartz Cancer Fatigue Scale (SCFS) is a reliable and valid 28-item tool. It assesses cancer-related fatigue across physical, emotional, cognitive, and temporal domains, aiding intervention evaluation.

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Area of Science:

  • Psychometric instrument development
  • Cancer symptom assessment
  • Nursing research

Background:

  • Cancer-related fatigue is a prevalent and debilitating symptom.
  • Existing measures may not fully capture the multidimensional nature of cancer fatigue.
  • A validated scale is needed for accurate assessment and intervention evaluation.

Purpose of the Study:

  • To psychometrically develop and validate the Schwartz Cancer Fatigue Scale (SCFS).
  • To establish the reliability and validity of the SCFS for assessing cancer-related fatigue.

Main Methods:

  • A multiphase instrumentation study involving construct definition, content validity, reliability, and validity analyses.
  • Content validity was assessed with 20 subjects; reliability and validity were evaluated with 166 subjects.
  • Factor analysis was employed to determine the scale's underlying structure.

Main Results:

  • Eleven items were eliminated due to poor performance, resulting in a 28-item scale.
  • Factor analysis yielded a four-factor solution (physical, emotional, cognitive, temporal) explaining 70% of the variance.
  • High reliability was demonstrated with Cronbach's alpha of 0.96 for the total scale and 0.82-0.93 for subscales.

Conclusions:

  • The 28-item SCFS demonstrates strong reliability and content/construct validity.
  • The four identified subscales are supported by factor analysis.
  • The SCFS shows preliminary construct validity and clinical relevance for assessing interventions for cancer-related fatigue.

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