Parallel-group CONSORT flow diagram
A parallel-group CONSORT flow diagram records the movement of participants through a randomized controlled trial. Begin with the number assessed for eligibility, then show exclusions with their reasons and the total randomized. Draw one branch for each allocated study arm. Within each branch, record how many participants received the assigned intervention, how many were lost to follow-up or discontinued, and how many were included in the final analysis. Counts should reconcile from one stage to the next. This diagram helps readers see attrition, departures from allocation, and the size of each analysis group without having to reconstruct those details from the text.
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Scenario
Reporting participant flow in a parallel-group randomized controlled trial.
Key decisions
- Screening count: Show everyone assessed before exclusions.
- Allocation counts: Keep randomized participants separate by study arm.
- Attrition reasons: State losses and discontinuations before analysis.
- Analysis set: Report the count included in each final analysis.
When to reuse this
Use this structure for a standard two-arm randomized controlled trial with a single follow-up period.
Frequently asked questions
What counts belong in a CONSORT flow diagram?
Should each study arm have its own branch?
Do the counts need to reconcile?
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