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Table 3 Outcomes of attempted home visits, for opt-in and opt-out arms of the trial (the number and percentage in each arm are shown)

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

Number of participants referred to interviewer for home visit

Opt-in N = 15

Opt-out N = 139

Participant traceable

6 (40 %)a

77 (55 %)

Discussion took place

4 (27 %)a

54 (39 %)

Consent to ALSPAC given

4 (27 %)a

46b(33 %)

  1. aWould have been 3 (100 %) if ‘returned to sender’ not included
  2. bIncludes one participant who preferred to give consent by telephone
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BMC Medical Research Methodology

ISSN: 1471-2288

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