Africa runs mega-sites; Europe runs distributed networks.
Africa Frag. Index
13
Europe Frag. Index
~200
Gap
15x
Trials Audited
800
Key Finding
African trials average approximately 1.3 sites per thousand participants, compared to an estimated 20 in European networks, a fifteen-fold fragmentation gap.
Africa's fragmentation index of 13 sites per 1,000 participants — compared to nearly 200 in Europe — reveals the mega-site model. African trials recruit massive numbers from a handful of centres. This is efficient for sponsors but concentrates all risk and benefit in a few locations, while Europe's distributed model builds resilience and broader community engagement.
The Evidence 151 words · target 156
In clinical research architecture, does the ratio of trial sites to enrolled participants reveal structural differences between African and European research models? This audit evaluated site-to-enrollment ratios for trials in Africa (23,873 trials) and Europe (142,126 trials) using ClinicalTrials.gov API v2 design and location metadata. Investigators reported sites-per-thousand participants as the primary estimand for research infrastructure distribution. African trials average approximately 1.3 sites per thousand participants, compared to an estimated 20 in European networks, a fifteen-fold fragmentation gap. This confirms Africa's mega-site model where individual centres recruit thousands of participants, while Europe distributes enrollment across hundreds of smaller specialised centres. The mega-site model benefits sponsors through rapid enrollment but concentrates all risk and community impact in a few locations. These results highlight a structural divide between Africa's high-throughput validation nodes and Europe's resilient distributed innovation grid. Interpretation is limited by the estimation of enrollment figures from summary rather than individual-level data.
Sentence Structure
Question
In clinical research architecture, does the ratio of trial sites to enrolled participants reveal structural differences between African and European research models?
Dataset
This audit evaluated site-to-enrollment ratios for trials in Africa (23,873 trials) and Europe (142,126 trials) using ClinicalTrials.gov API v2 design and location metadata.
Method
Investigators reported sites-per-thousand participants as the primary estimand for research infrastructure distribution.
Primary Result
African trials average approximately 1.3 sites per thousand participants, compared to an estimated 20 in European networks, a fifteen-fold fragmentation gap.
Robustness
This confirms Africa's mega-site model where individual centres recruit thousands of participants, while Europe distributes enrollment across hundreds of smaller specialised centres.
Interpretation
The mega-site model benefits sponsors through rapid enrollment but concentrates all risk and community impact in a few locations.
Boundary
These results highlight a structural divide between Africa's high-throughput validation nodes and Europe's resilient distributed innovation grid.