# Selection Pressure & Hardy Hub

In the ecology of clinical research systems, does resource scarcity create a natural selection effect that makes surviving African trials hardier than those in resource-rich environments? This ecological audit applied survival analysis to 23,873 African and 190,644 United States trials using completion and termination status data from ClinicalTrials.gov API v2. Investigators reported the completion-to-termination ratio as a hardy-hub index measuring research fitness under resource constraint. Africa's completion rate of 95.4% and termination rate of 2.2% yielded a hardiness ratio substantially different from the United States where 81.6% completed but termination rates were proportionally higher. Despite severe resource constraints, African trials that survive initiation demonstrate remarkable resilience in reaching completion. These findings suggest that selection pressure in low-resource environments eliminates marginal trials early, leaving only robust studies that merit completion. Interpretation is limited by the possibility that lower termination rates reflect weaker oversight rather than greater trial fitness.

## References

1. Alemayehu C, et al. "Behind the mask of the African clinical trials landscape." Trials. 2018;19:519.
2. Drain PK, et al. "Global migration of clinical trials." Nat Rev Drug Discov. 2018;17:765-766.
3. ClinicalTrials.gov API v2 Documentation. U.S. National Library of Medicine.

## Note Block

- Type: research
- App: https://mahmood726-cyber.github.io/africa-e156-students/geographic-equity/dashboards/selection-pressure.html
- Code: https://github.com/mahmood726-cyber/africa-e156-students/blob/master/geographic-equity/code/selection-pressure.py
- Data: ClinicalTrials.gov API v2
- Date: 2026-04-05