Article

Quality of Life Research

, Volume 20, Issue 9, pp 1447-1456

A 7-item version of the fatigue severity scale has better psychometric properties among HIV-infected adults: an application of a Rasch model

  • Anners LerdalAffiliated withLovisenberg Deaconal University College Email author 
  • , Anders KottorpAffiliated withDivision of Occupational Therapy, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet
  • , Caryl GayAffiliated withDepartment of Family Health Care Nursing, University of California, San Francisco
  • , Bradley E. AouizeratAffiliated withDepartment of Physiological Nursing and Institute for Human Genetics, University of California, San Francisco
  • , Carmen J. PortilloAffiliated withCommunity Health Systems, University of California, San Francisco
  • , Kathryn A. LeeAffiliated withDepartment of Family Health Care Nursing, University of California, San Francisco

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Abstract

Purpose

To examine the psychometric properties of the 9-item Fatigue Severity Scale (FSS) using a Rasch model application.

Methods

A convenience sample of HIV-infected adults was recruited, and a subset of the sample was assessed at 6-month intervals for 2 years. Socio-demographic, clinical, and symptom data were collected by self-report questionnaires. CD4 T-cell count and viral load measures were obtained from medical records. The Rasch analysis included 316 participants with 698 valid questionnaires.

Results

FSS item 2 did not advanced monotonically, and items 1 and 2 did not show acceptable goodness-of-fit to the Rasch model. A reduced FSS 7-item version demonstrated acceptable goodness-of-fit and explained 61.2% of the total variance in the scale. In the FSS-7 item version, no uniform Differential Item Functioning was found in relation to time of evaluation or to any of the socio-demographic or clinical variables.

Conclusion

This study demonstrated that the FSS-7 has better psychometric properties than the FSS-9 in this HIV sample and that responses to the different items are comparable over time and unrelated to socio-demographic and clinical variables.

Keywords

Fatigue HIV Psychometrics Symptoms Quality of life