What a registry record tells you before any results exist

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ClinicalTrials.gov and its international equivalents hold records that trials are required to file before they begin.

A registration is a plan, not a result

ClinicalTrials.gov and its international equivalents hold records that trials are required to file before they begin. A registry entry therefore describes an intention: what the investigators proposed to do, in whom, measuring what. It is evidence that a study exists. It is not evidence that the study finished, or that it found anything. A citation to a registry number in support of an outcome claim is citing the plan as though it were the result.

Recruitment status is the first thing to read

Every entry carries a status: not yet recruiting, recruiting, active, completed, terminated, withdrawn, or unknown. Terminated and withdrawn are informative in a way the others are not -- a trial stopped early sometimes stopped for futility or for harm, and the reason field occasionally says which. An entry whose status has been 'unknown' for years is one nobody has updated, which usually means it quietly ended.

Primary outcome, and why it is pre-specified

The primary outcome measure is declared before enrolment precisely so that it cannot be chosen afterwards from whatever happened to reach significance. When a published paper reports a different primary outcome from its registration, that discrepancy is visible to anyone who compares the two, and it is one of the few checks a non-expert can perform that genuinely distinguishes careful work from the rest.

Phase tells you what question was being asked

An early-phase trial is usually asking whether a dose is tolerated, in a small group, often without a control arm. It is not asking whether the compound works. Treating an early-phase safety result as evidence of efficacy is a category error, and it is a common one in supplement and research-compound marketing because early-phase records are plentiful and later-phase ones are not.

Enrolment numbers, and the gap between planned and actual

The entry gives a target enrolment; completed trials give the actual. A trial that planned 200 participants and enrolled 23 did not run the study it registered. The two numbers sitting side by side is one of the fastest sanity checks available.

Results posting is a legal obligation that is often unmet

Many jurisdictions require summary results to be posted to the registry within a set period after completion, and compliance is partial. An entry marked completed years ago with no results section is common, and it is informative: the trial ran, and whatever it found was never filed where it was supposed to be filed. That is a different situation from a trial that reported a null result, and worth distinguishing.

Sponsors and who paid

The sponsor and collaborator fields name who ran and funded the work. This is not a reason to discard a result, and treating industry funding as automatic disqualifier is its own error. It is context that belongs in the reading, in the same way the model and the sample size do.

Where to check this independently

The claims on this page about what a registry record tells you before any results exist can be checked against sources outside this site:

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