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Related Experiment Videos

Optimal reference population for the multiple sclerosis functional composite.

R J Fox1, J-C Lee, R A Rudick

  • 1Mellen Center for Multiple Sclerosis, Department of Neurology, Cleveland, OH, USA. foxr@ccf.org

Multiple Sclerosis (Houndmills, Basingstoke, England)
|May 1, 2007
PubMed
Summary
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Choosing the right reference population is crucial for accurately measuring changes in Multiple Sclerosis Functional Composite (MSFC) scores over time. Using the patient group

Area of Science:

  • Neurology
  • Clinical Research Methodology

Background:

  • The Multiple Sclerosis Functional Composite (MSFC) integrates multiple tests into a single score for assessing disease progression.
  • The selection of a reference population significantly influences the MSFC score, but this impact has not been thoroughly investigated.

Purpose of the Study:

  • To evaluate the effect of different reference populations on the derivation of the MSFC score in a longitudinal Multiple Sclerosis (MS) cohort.

Main Methods:

  • MSFC scores were calculated using three distinct reference populations: baseline study participants (n=60), healthy controls (n=18), and the National MS Society Task Force.
  • The study involved a cohort of MS patients monitored over a two-year period.

Main Results:

  • The choice of reference population significantly impacted the resulting MSFC Z-scores.

Related Experiment Videos

  • Certain reference populations diminished the statistical sensitivity to detect changes in MSFC scores over time.

    • Conclusions:

    • Longitudinal studies using composite MSFC Z-scores should utilize a reference population that mirrors the patient cohort, ideally using baseline measures.
    • This finding has critical implications for sample size calculations in clinical trials and longitudinal studies for MS.