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Related Experiment Videos

Referral bias in multiple sclerosis research.

L M Nelson1, G M Franklin, R F Hamman

  • 1Department of Neurology, University of Colorado School of Medicine, Denver.

Journal of Clinical Epidemiology
|January 1, 1988
PubMed
Summary

University multiple sclerosis centers attract younger patients with greater disability and earlier diagnoses, limiting natural history data collection but supporting intervention trials.

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Area of Science:

  • Neurology
  • Clinical Research Methodology
  • Epidemiology

Background:

  • Referral bias poses a significant challenge to the generalizability of clinical studies conducted in academic settings.
  • University-based multiple sclerosis (MS) referral centers may not accurately represent the broader MS patient population.

Purpose of the Study:

  • To investigate the presence and characteristics of referral bias within a university-affiliated multiple sclerosis referral center.
  • To compare the demographic and clinical features of patients attending the referral center versus those remaining in a population-based MS cohort.

Main Methods:

  • Comparative analysis of patient characteristics between a university MS referral center cohort and a population-based MS cohort.
  • Evaluation of factors including age, mobility impairment, sex distribution among disabled individuals, disease progression, diagnostic methods, and healthcare utilization.

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Main Results:

  • Referral center patients were younger, had greater mobility impairment for their age, and a higher proportion of disabled females.
  • Patients at the referral center more frequently reported recent disease worsening and had earlier diagnoses supported by laboratory tests.
  • Referral center patients exhibited higher utilization of neurologists and therapists for routine MS care.

Conclusions:

  • University MS referral centers exhibit significant referral bias, attracting a specific patient subgroup.
  • The characteristics of referred patients make these centers suitable for intervention trials but limit their utility for collecting representative natural history data.