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Gender imbalances induced by age limits in stroke trials
Christian Foerch1, Dirk Czapowski, Bjoern Misselwitz
1Department of Neurology, Johann Wolfgang Goethe University, Frankfurt am Main, Germany. foerch@em.uni-frankfurt.de
Neuroepidemiology
|September 24, 2010
Summary
Upper age limits in clinical trials for ischemic stroke disproportionately exclude older women. This gender disparity may lead to biased trial results and impact real-world treatment for women.
Area of Science:
- Neurology
- Clinical Trials
- Geriatrics
Background:
- Higher life expectancy leads to more elderly women.
- Ischemic stroke affects a greater proportion of elderly women.
- Clinical trials often impose upper age limits for safety and logistics.
Purpose of the Study:
- To model the gender disparity in stroke trials caused by upper age limits.
- To assess how age cut-offs favor male inclusion over female inclusion.
Main Methods:
- Analysis of a prospective hospital-based stroke registry in Hesse, Germany (2003-2005).
- Selection of patients with a diagnosis of ischemic stroke (ICD10:I63).
- Calculation of gender-specific exclusion proportions for various upper age limits (70, 75, 80, 85, 90 years).
Main Results:
- 34,754 ischemic stroke patients analyzed; 51% were women.
- Women were older on average (76.8 years) than men (70.2 years).
- All tested upper age limits excluded a higher percentage of women than men; an 80-year cut-off excluded 44% of women vs. 19% of men.
Conclusions:
- Upper age limits in ischemic stroke trials are not gender-neutral.
- These limits exclude a disproportionately higher percentage of female patients.
- Awareness of this gender imbalance is crucial for trial design and clinical practice.
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