Test-retest reliability and convergent validity of the fatigue impact scale for persons with multiple sclerosis

Virgil Mathiowetz

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

OBJECTIVE. The test-retest reliability and the convergent validity of the Fatigue Impact Scale (FIS) were evaluated using secondary data from 54 persons with multiple sclerosis (MS). METHODS. This reliability and validity study used FIS data from before and after two control periods to evaluate test-retest reliability. Convergent validity of the FIS with the Fatigue Severity Scale and with subscales of the SF-36 Health Survey was evaluated using data collected before the first control period. RESULTS. No significant differences between before and after FIS measurements and intraclass correlation coefficients ranging from .68 to .85 indicate that the FIS has good test-retest reliability except for the physical subscale. The expected moderate correlations between the FIS and several subscales of the SF-36 support its convergent validity. In contrast, the unexpected low correlation between the FIS and Fatigue Severity Scale does not support convergent validity. CONCLUSION. The FIS has adequate reliability and validity and is recommended to evaluate the effectiveness of fatigue management interventions such as energy conservation education for persons with MS.

Original languageEnglish (US)
Pages (from-to)389-395
Number of pages7
JournalAmerican Journal of Occupational Therapy
Volume57
Issue number4
DOIs
StatePublished - 2003

Keywords

  • Energy conservation
  • Fatigue assessment
  • Rehabilitation

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