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clinical research · trial reporting

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.

Tipo FluxogramaNorma Sugiyama layered DAG + orthogonal routingMecanismo schematex-flowchartAtualizado 24/09/2026
Two-arm randomized trial participant flow
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A solicitação

“Draw a two-arm CONSORT flow diagram with 240 assessed, 40 excluded, 200 randomized, 100 allocated to intervention and 100 to control, received counts, follow-up losses and discontinuations, and 95 versus 97 analysed.”

Depois, tenteAdd reasons for the 40 exclusions.Change the intervention arm to 120 participants.
O que há neste desenho

Entenda as decisões por trás dele.

01Screening count

Show everyone assessed before exclusions.

02Allocation counts

Keep randomized participants separate by study arm.

03Attrition reasons

State losses and discontinuations before analysis.

04Analysis set

Report the count included in each final analysis.

Use this structure for a standard two-arm randomized controlled trial with a single follow-up period.

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Perguntas frequentes

Dúvidas comuns

What counts belong in a CONSORT flow diagram?

Show counts for assessment, exclusion, randomization, allocation, follow-up, and analysis, with reasons where participants leave the study.

Should each study arm have its own branch?

Yes. Separate branches make allocation, attrition, and final analysis counts clear for each arm.

Do the counts need to reconcile?

Yes. The participant totals at each stage should explain how the randomized total leads to the final analysis sets.