CT.gov Country Enrollment Gap
2026-03-29 | full-registry ct.gov audit | plots, figures, and e156 bundle
Series
IndustrySponsor-ClassPhaseStructural MissingnessEvidence VisibilityCompletion CohortCondition HiddennessSponsor ConcentrationRule-Era ReportingPublication UndercountOncology HiddennessCardiovascular HiddennessMetabolic HiddennessEnrollment-SizeGeography-ScaleDesign-PurposeCompletion-DelayTrial-ArchitectureIntervention-TypeCountry ReportingStopped-TrialOutcome-DensityActual-FieldUs-Versus-GlobalModality-SponsorCountry-ConditionDisease-GeographyCondition-SponsorCountry-SponsorUs-Versus-Ex-UsIndustry-FamilyRisk-Adjusted HiddennessOverdue Results ClockPublication Index GapProbable Act/Fdaaa DebtSponsor Excess WatchlistCountry Excess WatchlistCondition Excess WatchlistBlack-Box TrialsStrict-Proxy RepeatersSponsor Ghost RepeatersCountry Ghost WatchlistCondition Ghost WatchlistBlack-Box Sponsor RepeatersStrict-Core Black-BoxSponsor Overdue DebtCountry Overdue DebtCondition Overdue DebtNarrative-Gap RepeatersActual-Discipline RepeatersSponsor Ancient BacklogCountry Ancient BacklogCondition Ancient BacklogDescription-Black-Box RepeatersCompletion-Timing RepeatersCountry Description Black-BoxCondition Description Black-BoxSponsor Enrollment-Gap RepeatersCountry Enrollment-GapCondition Enrollment-GapCountry Black BoxCondition Black BoxSponsor EnrollmentCountry EnrollmentCondition Enrollment
Country Enrollment-Gap Dashboard

Country enrollment-gap tables show where older CT.gov records still omit realized sample size

The United States dominates country-linked enrollment-gap stock, Canada and Germany stay prominent, and Iran plus Israel are the sharpest large-country rate outliers.

Open dashboardRead E156 paperProtocolSeries hub
Enrollment stock
Rate
Countries
Actual enrollment

Dashboard

Open dashboard at rootRead E156 micro-paperOpen protocolOpen series hub

The United States leads country-linked enrollment-gap stock, Canada and Germany follow, and Iran is the sharpest large-country rate outlier.

How to read the dashboard
US stock
4,573
Enrollment-gap studies
Canada stock
797
Enrollment-gap studies
Iran rate
6.3%
Large-country rate
Israel rate
6.1%
Large-country rate
Enrollment-gap stock
ENROLLMENT STOCKTop country-linked enrollment-gap countsUnited States4,573Canada797Germany663France559United Kingdom533Netherlands318Italy318Belgium304Spain297Denmark290
The United States dominates on stock because of scale.
Canada, Germany, and France remain the next biggest country-linked enrollment-gap portfolios.
Enrollment-gap rate
ENROLLMENT RATELarge-country enrollment-gap rateIran6.3%Israel6.1%Norway5.4%Denmark4.9%Finland4.7%Canada4.6%Switzerland4.6%Austria4.5%Germany4.4%Netherlands4.4%
Iran, Israel, and Norway are the sharpest rate outliers.
Rate again tells a different story from stock alone.
Read Across Projects

Across The Series

Each project isolates a different dimension of registry opacity, but the point is the contrast between them, not a single leaderboard.

Industry
Industry project

Industry project from the CT.gov hiddenness series.

Sponsor-Class
Sponsor-class project

Sponsor-class project from the CT.gov hiddenness series.

Phase
Phase project

Phase project from the CT.gov hiddenness series.

Structural Missingness
Structural missingness project

Structural missingness project from the CT.gov hiddenness series.

Evidence Visibility
Evidence visibility project

Evidence visibility project from the CT.gov hiddenness series.

Completion Cohort
Completion cohort project

Completion cohort project from the CT.gov hiddenness series.

Condition Hiddenness
Condition hiddenness project

Condition hiddenness project from the CT.gov hiddenness series.

Sponsor Concentration
Sponsor concentration project

Sponsor concentration project from the CT.gov hiddenness series.

Rule-Era Reporting
Rule-era reporting project

Rule-era reporting project from the CT.gov hiddenness series.

Publication Undercount
Publication undercount audit

Publication undercount audit from the CT.gov hiddenness series.

Oncology Hiddenness
Oncology hiddenness project

Oncology hiddenness project from the CT.gov hiddenness series.

Cardiovascular Hiddenness
Cardiovascular hiddenness project

Cardiovascular hiddenness project from the CT.gov hiddenness series.

Metabolic Hiddenness
Metabolic hiddenness project

Metabolic hiddenness project from the CT.gov hiddenness series.

Enrollment-Size
Enrollment-size project

Enrollment-size project from the CT.gov hiddenness series.

Geography-Scale
Geography-scale project

Geography-scale project from the CT.gov hiddenness series.

Design-Purpose
Design-purpose project

Design-purpose project from the CT.gov hiddenness series.

Completion-Delay
Completion-delay project

Completion-delay project from the CT.gov hiddenness series.

Trial-Architecture
Trial-architecture project

Trial-architecture project from the CT.gov hiddenness series.

Intervention-Type
Intervention-type project

Intervention-type project from the CT.gov hiddenness series.

Country Reporting
Country reporting project

Country reporting project from the CT.gov hiddenness series.

Stopped-Trial
Stopped-trial project

Stopped-trial project from the CT.gov hiddenness series.

Outcome-Density
Outcome-density project

Outcome-density project from the CT.gov hiddenness series.

Actual-Field
Actual-field project

Actual-field project from the CT.gov hiddenness series.

Us-Versus-Global
US-versus-global project

US-versus-global project from the CT.gov hiddenness series.

Modality-Sponsor
Modality-sponsor project

Modality-sponsor project from the CT.gov hiddenness series.

Country-Condition
Country-condition project

Country-condition project from the CT.gov hiddenness series.

Disease-Geography
Disease-geography project

Disease-geography project from the CT.gov hiddenness series.

Condition-Sponsor
Condition-sponsor project

Condition-sponsor project from the CT.gov hiddenness series.

Country-Sponsor
Country-sponsor project

Country-sponsor project from the CT.gov hiddenness series.

Us-Versus-Ex-Us
US-versus-ex-US project

US-versus-ex-US project from the CT.gov hiddenness series.

Industry-Family
Industry-family project

Industry-family project from the CT.gov hiddenness series.

Risk-Adjusted Hiddenness
Risk-adjusted hiddenness

Risk-adjusted hiddenness from the CT.gov hiddenness series.

Overdue Results Clock
Overdue results clock

Overdue results clock from the CT.gov hiddenness series.

Publication Index Gap
Publication index gap

Publication index gap from the CT.gov hiddenness series.

Probable Act/Fdaaa Debt
Probable ACT/FDAAA debt

Probable ACT/FDAAA debt from the CT.gov hiddenness series.

Sponsor Excess Watchlist
Sponsor excess watchlist

Sponsor excess watchlist from the CT.gov hiddenness series.

Country Excess Watchlist
Country excess watchlist

Country excess watchlist from the CT.gov hiddenness series.

Condition Excess Watchlist
Condition excess watchlist

Condition excess watchlist from the CT.gov hiddenness series.

Black-Box Trials
Black-box trials

Black-box trials from the CT.gov hiddenness series.

Strict-Proxy Repeaters
Strict-proxy repeaters

Strict-proxy repeaters from the CT.gov hiddenness series.

Sponsor Ghost Repeaters
Sponsor ghost repeaters

Sponsor ghost repeaters from the CT.gov hiddenness series.

Country Ghost Watchlist
Country ghost watchlist

Country ghost watchlist from the CT.gov hiddenness series.

Condition Ghost Watchlist
Condition ghost watchlist

Condition ghost watchlist from the CT.gov hiddenness series.

Black-Box Sponsor Repeaters
Black-box sponsor repeaters

Black-box sponsor repeaters from the CT.gov hiddenness series.

Strict-Core Black-Box
Strict-core black-box

Strict-core black-box from the CT.gov hiddenness series.

Sponsor Overdue Debt
Sponsor overdue debt

Sponsor overdue debt from the CT.gov hiddenness series.

Country Overdue Debt
Country overdue debt

Country overdue debt from the CT.gov hiddenness series.

Condition Overdue Debt
Condition overdue debt

Condition overdue debt from the CT.gov hiddenness series.

Narrative-Gap Repeaters
Narrative-gap repeaters

Narrative-gap repeaters from the CT.gov hiddenness series.

Actual-Discipline Repeaters
Actual-discipline repeaters

Actual-discipline repeaters from the CT.gov hiddenness series.

Sponsor Ancient Backlog
Sponsor ancient backlog

Sponsor ancient backlog from the CT.gov hiddenness series.

Country Ancient Backlog
Country ancient backlog

Country ancient backlog from the CT.gov hiddenness series.

Condition Ancient Backlog
Condition ancient backlog

Condition ancient backlog from the CT.gov hiddenness series.

Description-Black-Box Repeaters
Description-black-box repeaters

Description-black-box repeaters from the CT.gov hiddenness series.

Completion-Timing Repeaters
Completion-timing repeaters

Completion-timing repeaters from the CT.gov hiddenness series.

Country Description Black-Box
Country description black-box

Country description black-box from the CT.gov hiddenness series.

Condition Description Black-Box
Condition description black-box

Condition description black-box from the CT.gov hiddenness series.

Sponsor Enrollment-Gap Repeaters
Sponsor enrollment-gap repeaters

Sponsor enrollment-gap repeaters from the CT.gov hiddenness series.

Condition Enrollment-Gap
Condition enrollment-gap

Condition enrollment-gap from the CT.gov hiddenness series.

Country Black Box
CT.gov Country Description Black-Box

Country-linked tables for older CT.gov studies that are overdue, unlinked, and missing both main descriptive text fields.

Condition Black Box
CT.gov Condition Description Black-Box

Condition-family tables for older CT.gov studies that remain overdue, unlinked, and textually opaque.

Sponsor Enrollment
CT.gov Sponsor Enrollment-Gap Repeaters

Named-sponsor tables showing where older CT.gov records still omit actual enrollment most often.

Condition Enrollment
CT.gov Condition Enrollment Gap

Condition-family tables showing where older CT.gov records most often omit realized sample size.

Source on GitHub | Project home | Dashboard