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

Table 4 For YPs only: Number who consented to participate in ALSPAC and outcomes regarding consent for data linkage, for opt-in and opt-out arms of the trial (the number and percentage in each arm are shown)

Number of YPs who consented to participate in ALSPAC	Opt-in N = 3	Opt-out N = 24^a
Data linkage discussed	3 (100 %)	22 (92 %)
Consent to at least one type of data linkage^b	3 (100 %)	22 (92 %)
Consent to any data linkage refused	0 (0 %)	0 (0 %)

^aExcluding the participant who gave consent by telephone
^bLinkage to the following routine records: Health, School, Higher Education, Benefits, Earnings and Employment, Criminal Convictions and Cautions

ISSN: 1471-2288