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Fig. 1 | BMC Medical Research Methodology

Fig. 1

From: A randomised controlled trial comparing opt-in and opt-out home visits for tracing lost participants in a prospective birth cohort study

Fig. 1

Participant flow diagram for the randomised controlled trial showing the number of eligible participants, random selection of participants from those eligible, random allocation to the opt-in and opt-out arms of the trial, numbers withdrawn after randomisation, and numbers who opted in or out in each arm. It also shows outcomes in each arm of the trial - numbers traced, who consented to continue in ALSPAC, and who consented to data linkage (YPs only)

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