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Table 2 Numbers of participants sent an invitation letter, number for whom the letter was returned to sender, and the numbers of participants referred to a fieldworker for a home visit (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 sent an invitation letter Opt-in N = 145 Opt-out N = 139
Returned to sender 12 (8 %) 14 (10 %)
Opted-in 3 (2 %) N/A
Referred for home visit 15 (10 %)a 139 (100 %)
  1. aWould have been 3 (2 %) if ‘returned to sender’ not included