The Sahel belt — stretching from Mauritania to Chad — combines extreme poverty, ...
Africa Trials
3,515
US Trials
159,433
Gap Ratio
45x
Nations
54
Key Finding
Africa hosts 23,873 trials across 54 nations with extreme geographic concentration.
Regional Comparison
Distribution Analysis
Inequality Profile
Temporal & Structural
Why It Matters
The Sahel belt — stretching from Mauritania to Chad — combines extreme poverty, climate vulnerability, and active conflict, creating a vast research void across six nations with a combined population exceeding 100 million.
The Evidence 126 words · target 156
In the spatial mapping of African clinical research, does the pattern of sahel belt void reveal structural inequity in African research investment? This cross-sectional audit evaluated 23,873 African and 190,644 United States interventional trials registered on ClinicalTrials.gov through April 2026. Investigators computed the Bayesian posterior trial rate as the primary estimand using registry metadata for each nation. Africa registered 3,515 relevant trials compared to 159,433 in the United States, revealing an 45-fold absolute gap in research volume. Shannon entropy of the trial distribution was 1.93 bits, confirming substantial concentration beyond random variation. These findings reveal a geographic research monopoly where most African nations remain functionally invisible in the clinical evidence landscape. Interpretation is limited by reliance on ClinicalTrials.gov alone, which may undercount locally registered African studies.
Sentence Structure
Question
In the spatial mapping of African clinical research, does the pattern of sahel belt void reveal structural inequity in African research investment?
Dataset
This cross-sectional audit evaluated 23,873 African and 190,644 United States interventional trials registered on ClinicalTrials.
Method
gov through April 2026.
Primary Result
Investigators computed the Bayesian posterior trial rate as the primary estimand using registry metadata for each nation.
Robustness
Africa registered 3,515 relevant trials compared to 159,433 in the United States, revealing an 45-fold absolute gap in research volume.
Interpretation
Shannon entropy of the trial distribution was 1.
Boundary
93 bits, confirming substantial concentration beyond random variation.
Extra
These findings reveal a geographic research monopoly where most African nations remain functionally invisible in the clinical evidence landscape.
Extra
Interpretation is limited by reliance on ClinicalTrials.
Extra
gov alone, which may undercount locally registered African studies.