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Multiple secondary outcome analyses: precise interpretation is important.

Richard A Parker1, Christopher J Weir2

  • 1Edinburgh Clinical Trials Unit, Usher Institute, University of Edinburgh, Edinburgh, UK. Richard.Parker@ed.ac.uk.

Trials
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Clinical trial secondary outcomes do not need to be exploratory even without multiplicity adjustments. Careful interpretation of individual results, focusing on the per-comparison error rate, allows serious consideration of strong effects.

Keywords:
Multiple testing, Secondary outcomes, Family-wise error rate, Per-comparison wise error rate, Type-I error, Multiplicity

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Area of Science:

  • Clinical trial methodology
  • Statistical analysis in research
  • Evidence-based medicine

Background:

  • Multiple secondary outcomes in clinical trials increase the risk of false positive results.
  • Current practice often labels analyses without multiplicity adjustments as exploratory.

Discussion:

  • This paper challenges the automatic classification of unadjusted secondary outcome analyses as exploratory.
  • The per-comparison error rate remains constant, irrespective of the number of secondary outcomes tested.
  • Careful and precise interpretation of individual secondary outcome results is crucial.

Key Insights:

  • Strong significant effects on secondary outcomes warrant serious consideration, not dismissal due to multiplicity concerns.
  • The focus should be on the interpretation of each result rather than solely on the number of tests performed.
  • Statistical rigor can be maintained without mandatory multiplicity adjustments for secondary outcomes.

Outlook:

  • Re-evaluating statistical interpretation guidelines for clinical trial secondary outcomes.
  • Promoting nuanced interpretation of research findings to enhance clinical decision-making.
  • Further research into the impact of multiplicity on the interpretation of secondary endpoints.