How to Write a Clinical Study Report
Report a completed trial so a reviewer can reconstruct it without asking for the database.
What a how-to is not
A how-to is SPEQ’s practitioner method, not a procedure. It does not replace your own SOP, it is not a validated approach, and the judgement calls in it belong to your quality unit.
The study report is the trial as it will be read. Its structure exists so that a reviewer can find the same information in the same place across sponsors and programmes, and its integrity rests on one thing: the report must describe what was actually done, including the parts that went wrong. Reports fail review for omission far more often than for poor results.
- 1
Follow the expected structure rather than a house format
The common structure exists so reviewers can navigate a report they have never seen. A well-written report in a bespoke arrangement costs the reviewer time and invites questions that would not otherwise arise.
- 2
State the objectives and the design as they were, including amendments
Describe the design actually run and every amendment, with its timing and its rationale. An amendment made after enrolment began that is described as though it was the original design is a serious integrity problem, not a presentational choice.
- 3
Account for every participant enrolled
Disposition must reconcile: screened, enrolled, treated, completed, discontinued, with reasons. A participant who cannot be accounted for is the fastest route to a question about the whole dataset, because it puts the completeness of everything else in doubt.
- 4
Report the analysis that was pre-specified, and label anything else
The pre-specified primary analysis is reported as primary regardless of what it showed. Post-hoc and exploratory analyses are welcome and must be labelled as such — an unlabelled post-hoc analysis presented alongside pre-specified results is the defect, not the analysis itself.
- 5
Present safety without filtering
Report adverse events, deaths, serious events and discontinuations for safety completely, including those judged unrelated. Causality assessment belongs in the discussion; it is not a filter applied before the tables.
- 6
Disclose important deviations and their handling
Summarise the deviations that mattered, how they were handled, and any effect on the analysis. A report whose deviation section is thinner than the deviation log invites reconciliation of the two, and that comparison never goes well.
- 7
Attach the appendices that let the report be checked
Protocol and amendments, the analysis plan, sample consent, investigator and site list, and the participant-level listings the report relies on. The report is the argument; the appendices are what make it verifiable rather than asserted.
- !Amendments described as though they were the original design, hiding when a change was made relative to enrolment.
- !Disposition that does not reconcile, leaving participants unaccounted for.
- !Post-hoc analyses presented without labelling, alongside pre-specified results.
- !A deviation section materially thinner than the deviation log it should summarise.
How to Write a Clinical Study Report: frequently asked questions
Common questions on write a clinical study report.
What if the primary analysis did not show an effect?
Report it as the primary result. Exploratory analyses may be reported alongside it, labelled as exploratory. Promoting a secondary or post-hoc analysis to the position of the primary result is a reporting integrity failure regardless of how defensible the alternative analysis is on its own terms.
How much detail belongs in the body versus the appendices?
The body should let a reader follow the trial and its conclusions without the appendices; the appendices should let a reviewer verify what the body claims. If a reader cannot follow the argument without opening a listing, the body is too thin.
Do deviations have to be in the report?
The important ones do, with how they were handled and what effect they had. Report readers reconcile that section against the deviation log, so a summary that understates the log is worse than a full account of a messy trial — the discrepancy raises a question about everything else.