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Measuring fatigue in persons with multiple sclerosis: creating a crosswalk between the Modified Fatigue Impact Scale and the PROMIS Fatigue Short Form

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Abstract

Purpose

To create cross-walk tables to associate scores for the Modified Fatigue Impact Scale (MFIS) with scores for the Patient Reported Outcome Measurement Information System (PROMIS) Fatigue Short Form (SF) in persons with Multiple Sclerosis (MS).

Methods

Cross-walk tables were created using equipercentile linking and based on data collected at one time point in a longitudinal study of persons with MS (N = 458). Validation of the tables was conducted using data collected at a subsequent time point (N = 444). Deviations between estimates and actual scores were compared across levels of fatigue. The impact of sample size on the precision of sample mean estimates was evaluated using bootstrapping.

Results

Correlations between deviations and fatigue level for the PROMIS Fatigue SF and MFIS were (−0.31) and (−0.30), respectively, indicating moderately greater deviations with lower fatigue scores. Estimated sample means were impacted by sample size.

Conclusions

Cross-walk tables allow data from studies using different measures of fatigue to be combined to achieve larger sample sizes and to compare results. These tables are valid for group-level analyses with sample sizes of 150 or greater.

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Acknowledgments

The contents of this manuscript were developed under grants from the Department of Education, National Institute on Disability and Rehabilitation Research grant numbers H133B031129 and H133B080025, and the National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institute of Health (Grant 5U01AR052171). However, these contents do not necessarily represent the policy of the Department of Education, and you should not assume endorsement by the Federal Government.

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Authors and Affiliations

  1. Department of Rehabilitation Medicine, University of Washington, Box 356490, Seattle, WA, 98195, USA

    Vanessa K. Noonan, Karon F. Cook, Alyssa M. Bamer, Jiseon Kim & Dagmar Amtmann

  2. Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA

    Seung W. Choi

Authors
  1. Vanessa K. Noonan
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  2. Karon F. Cook
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  3. Alyssa M. Bamer
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  4. Seung W. Choi
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  5. Jiseon Kim
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  6. Dagmar Amtmann
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Correspondence to Vanessa K. Noonan.

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Noonan, V.K., Cook, K.F., Bamer, A.M. et al. Measuring fatigue in persons with multiple sclerosis: creating a crosswalk between the Modified Fatigue Impact Scale and the PROMIS Fatigue Short Form. Qual Life Res 21, 1123–1133 (2012). https://doi.org/10.1007/s11136-011-0040-3

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  • DOI: https://doi.org/10.1007/s11136-011-0040-3

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