Research Workbench

Trial Flow Count Reconciler

Find arithmetic discrepancies across screening, allocation, intervention receipt and analysis counts.

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Reconcile aggregate counts for a simple two-arm parallel randomized trial. Use one prespecified outcome and time point for the analysis counts. The intervention and analysis branches both start from allocation; they are not a serial subtraction. All default values are fictional.

ScreenedExcluded before randomizationRandomizedAllocated to group AAllocated to group BGroup A: received interventionGroup A: did not receive interventionGroup B: received interventionGroup B: did not receive interventionGroup A: analyzed for selected outcomeGroup A: not analyzed for selected outcomeGroup B: analyzed for selected outcomeGroup B: not analyzed for selected outcome

Calculation results

All six arithmetic checks balance. Review reasons and participant identity separately.

Participant-flow arithmetic checks
Stage	Upstream	Accounted
Screening	150	150
Allocation	100	100
Group A intervention	50	50
Group B intervention	50	50
Group A analysis	50	50
Group B analysis	50	50

Assumptions and limits

For each stage, gap = upstream count − sum of mutually exclusive downstream categories. Zero means arithmetic balance only; a negative gap means excess accounting, and a positive gap means unexplained participants. This cannot detect double-counted people, prove eligibility, validate exclusions, or decide the appropriate analysis population. Include participants in the allocated arm even if treatment was not received when describing allocation. Retain reasons and source records. Not for crossover, cluster-level flow, multi-arm or nonrandomized designs without adapting the structure.

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