CT.gov Hiddenness Atlas
2026-03-29 | full-registry audit | plots, figures, and E156 bundle
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What the full CT.gov registry still does not show

This page combines rate, stock, and structural sparsity views so the disclosure burden is not mistaken for a single-sector problem.

Main figures
Sponsor classes
Absolute stock
Structural gaps

Main Dashboard

Registry size
578,109
All studies
Closed interventional
290,524
Primary comparison set
Eligible older studies
249,507
2-year denominator
2-year no-results
72.7%
Among eligible older studies
NO-RESULTS RATE2-year no-results rate among eligible older closed interventional studiesOTHER_GOV95.7%OTHER80.0%INDUSTRY58.1%NETWORK71.6%INDIV69.2%NIH53.6%FED45.3%
OTHER_GOV is worst on rate, OTHER is worst on total stock, and industry still carries a large unresolved block.
HIDDEN RESULTS STOCKAbsolute 2-year no-results counts by sponsor classOTHER127,704INDUSTRY44,007OTHER_GOV4,378NIH2,298NETWORK1,645FED1,199INDIV209
Volume matters. OTHER dominates absolute stock, but industry still contributes more than forty-four thousand long-past missing-results studies.
STRUCTURAL SPARSITYGlobal missingness rates across the full registryNo publication link63.4%No IPD statement48.3%No detailed description32.7%No locations10.2%
What disappears is not just results. Publication links, IPD statements, detailed descriptions, and even locations are often absent.