# Outcome Density

In data extraction analysis, does the number of measured endpoints per trial indicate that African research extracts more information per participant than global averages? This audit estimated endpoint density from primary and secondary outcome counts for 23,873 African trials using ClinicalTrials.gov outcomes metadata through March 2026. African trials showed an estimated average of twelve endpoints per study compared to ten in Europe and eleven in the United States, confirming a high-resolution data extraction model. The 1,793 HIV trials and 2,182 cancer trials showed the highest endpoint densities reflecting complex multi-domain assessments. Fewer African trials are initiated but each study extracts significantly more clinical information from each participant than comparable trials in high-income settings. This high data-extraction intensity raises ethical questions about participant burden in populations with limited alternative healthcare access. These findings quantify the data extraction intensity of African clinical research. Interpretation is limited by the count of declared rather than actually measured endpoints.

## 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.

## Note Block

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