E156 Micro-Paper · Africa Clinical Trials

Statistical Analysis Plan Depth

A pre-specified SAP prevents outcome switching and p-hacking, but SAP completene...

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
Phase Distribution Africa US Europe Phase 1 11 111.5 75.9 Phase 2 20 289.7 66.1 Phase 3 52 499.7 159.2 Phase 4 12 104.5 46.8 499.7 11
Statistical Analysis Plan Depth by Country Egypt: 11752 Algeria: N/A Morocco: 162 Tunisia: 540 Senegal: N/A Ghana: 261 Nigeria: 379 Cameroon: N/A DRC: N/A Ethiopia: 302 Kenya: 788 Uganda: 809 Tanzania: 460 Rwanda: N/A South Africa: 3654 Egy 11752 Sou 3654 Uga 809 Ken 788 Tun 540 162 11752
Distribution Analysis
Research Profile Volume Growth Phase3 Complete Diversity
Contribution Breakdown 11752 Egypt 3654 South Afri 809 Uganda 788 Kenya 540 Tunisia 2814 Others
Inequality Profile
Enrollment Distribution Africa Reference 10000 20000 30000
No data
Temporal & Structural
Regional Comparison Africa US Europe 0 50000 100000 150000 200000
Growth 2010-2026 Before After Africa 0 0 US 0 0 Europe 0 0
Why It Matters

A pre-specified SAP prevents outcome switching and p-hacking, but SAP completeness in African trials lags behind global standards, partly due to limited biostatistics capacity.

The Evidence   127 words · target 156
In the methodological architecture of African clinical research, does the pattern of statistical analysis plan depth 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 chi-squared test of distributional uniformity 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 2.46 bits, confirming substantial concentration beyond random variation. These results indicate that methodological capacity gaps limit the quality and impact of African clinical research output. Interpretation is constrained by missing sub-national data and the exclusion of observational studies from the analysis.
Sentence Structure
Question

In the methodological architecture of African clinical research, does the pattern of statistical analysis plan depth 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 chi-squared test of distributional uniformity 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 2.

Boundary

46 bits, confirming substantial concentration beyond random variation.

Extra

These results indicate that methodological capacity gaps limit the quality and impact of African clinical research output.

Extra

Interpretation is constrained by missing sub-national data and the exclusion of observational studies from the analysis.

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