Three-arm CONSORT flow diagram
A three-arm CONSORT flow diagram extends the usual parallel trial structure by adding one allocation branch. The enrollment section records who was assessed, excluded, and randomized. Each arm then needs its own allocation, follow-up, and analysis counts. Put the treatment or dose name in the allocation box so readers can match the branch to the study methods. If participants discontinue or are excluded from analysis, record the count and reason in the correct branch. Keeping each arm aligned beneath randomization makes it easy to compare retention and analysis populations across all groups. Use the final counts that correspond to the analysis described in the results.
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Scenario
Reporting allocation and retention in a three-arm dose-comparison trial.
Key decisions
- Common entry: Keep screening and randomization together before branches.
- Equal allocation: Label the assigned count for every arm.
- Parallel follow-up: Show completion separately in each arm.
- Final analysis: Keep analysed counts directly below their arm.
When to reuse this
Use this for trials comparing two active doses with placebo or any other three parallel treatment groups.
Frequently asked questions
Can a CONSORT diagram show three study arms?
Where do dose names go?
How should follow-up be reported?
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