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Psychometric properties of three Fatigue Rating Scales in individuals with late effects of polio

Lexell, Jan LU ; Jonasson, Stina B. LU and Brogardh, Christina LU (2018) In Annals of Rehabilitation Medicine 42(5). p.702-712
Abstract

Objective To evaluate the psychometric properties of the Fatigue Severity Scale (FSS), the Fatigue Impact Scale (FIS), and the Multidimensional Fatigue Inventory (MFI-20) in persons with late effects of polio (LEoP). More specifically, we explored the data completeness, scaling assumptions, targeting, reliability, and convergent validity. Methods A postal survey including FSS, FIS, and MFI-20 was administered to 77 persons with LEoP. Responders received a second survey after 3 weeks to enable test-retest reliability analyses. Results Sixty-one persons (mean age, 68 years; 54% women) responded to the survey (response rate 79%). Data quality of the rating scales was high (with 0%-0.5% missing item responses), the corrected item-total... (More)

Objective To evaluate the psychometric properties of the Fatigue Severity Scale (FSS), the Fatigue Impact Scale (FIS), and the Multidimensional Fatigue Inventory (MFI-20) in persons with late effects of polio (LEoP). More specifically, we explored the data completeness, scaling assumptions, targeting, reliability, and convergent validity. Methods A postal survey including FSS, FIS, and MFI-20 was administered to 77 persons with LEoP. Responders received a second survey after 3 weeks to enable test-retest reliability analyses. Results Sixty-one persons (mean age, 68 years; 54% women) responded to the survey (response rate 79%). Data quality of the rating scales was high (with 0%-0.5% missing item responses), the corrected item-total correlations exceeded 0.4 and the scales showed very little floor or ceiling effects (0%-6.6%). All scales had an acceptable reliability (Cronbach's α ≥ 0.95) and test-retest reliability (intraclass correlation coefficient, ≥ 0.80). The standard error of measurement and the smallest detectable difference were 7%-10% and 20%-28% of the possible scoring range. All three scales were highly correlated (Spearman's correlation coefficient rs=0.79-0.80; p < 0.001). Conclusion The FSS, FIS, and MFI-20 exhibit sound psychometric properties in terms of data completeness, scaling assumptions, targeting, reliability, and convergent validity, suggesting that these three rating scales can be used to assess fatigue in persons with LEoP. As FSS has fewer items and therefore is less time consuming it may be the preferred scale. However, the choice of scale depends on the research question and the study design.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fatigue, Postpoliomyelitis syndrome, Psychometrics, Rehabilitation, Reliability of results
in
Annals of Rehabilitation Medicine
volume
42
issue
5
pages
11 pages
external identifiers
  • scopus:85056779249
ISSN
2234-0645
DOI
10.5535/arm.2018.42.5.702
language
English
LU publication?
yes
id
b4cffeaa-4490-4ef4-8058-5b6a1a967e69
date added to LUP
2018-11-28 09:03:01
date last changed
2019-01-14 07:40:30
@article{b4cffeaa-4490-4ef4-8058-5b6a1a967e69,
  abstract     = {<p>Objective To evaluate the psychometric properties of the Fatigue Severity Scale (FSS), the Fatigue Impact Scale (FIS), and the Multidimensional Fatigue Inventory (MFI-20) in persons with late effects of polio (LEoP). More specifically, we explored the data completeness, scaling assumptions, targeting, reliability, and convergent validity. Methods A postal survey including FSS, FIS, and MFI-20 was administered to 77 persons with LEoP. Responders received a second survey after 3 weeks to enable test-retest reliability analyses. Results Sixty-one persons (mean age, 68 years; 54% women) responded to the survey (response rate 79%). Data quality of the rating scales was high (with 0%-0.5% missing item responses), the corrected item-total correlations exceeded 0.4 and the scales showed very little floor or ceiling effects (0%-6.6%). All scales had an acceptable reliability (Cronbach's α ≥ 0.95) and test-retest reliability (intraclass correlation coefficient, ≥ 0.80). The standard error of measurement and the smallest detectable difference were 7%-10% and 20%-28% of the possible scoring range. All three scales were highly correlated (Spearman's correlation coefficient r<sub>s</sub>=0.79-0.80; p &lt; 0.001). Conclusion The FSS, FIS, and MFI-20 exhibit sound psychometric properties in terms of data completeness, scaling assumptions, targeting, reliability, and convergent validity, suggesting that these three rating scales can be used to assess fatigue in persons with LEoP. As FSS has fewer items and therefore is less time consuming it may be the preferred scale. However, the choice of scale depends on the research question and the study design.</p>},
  author       = {Lexell, Jan and Jonasson, Stina B. and Brogardh, Christina},
  issn         = {2234-0645},
  keyword      = {Fatigue,Postpoliomyelitis syndrome,Psychometrics,Rehabilitation,Reliability of results},
  language     = {eng},
  number       = {5},
  pages        = {702--712},
  series       = {Annals of Rehabilitation Medicine},
  title        = {Psychometric properties of three Fatigue Rating Scales in individuals with late effects of polio},
  url          = {http://dx.doi.org/10.5535/arm.2018.42.5.702},
  volume       = {42},
  year         = {2018},
}