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Table 2 Comparison of response rates throughout follow-up based on response or non-response to EFU

From: Converting from face-to-face to postal follow-up and its effects on participant retention, response rates and errors: lessons from the EQUAL study in the UK

Timepoint, in months EFU Response Responded (%) Difference in response rates (%)
0 Responder 90.0 7.0
Non-responder 83.0
6 Responder 76.7 8.7
Non-responder 67.9
12 Responder 70.0 9.6
Non-responder 60.4
18 Responder 68.3 23.1
Non-responder 45.3
24 Responder 48.3 12.5
Non-responder 35.8
30 Responder 21.7 2.8
Non-responder 18.9
36 Responder 13.3 0.1
Non-responder 13.2
42 Responder 3.3 1.4
Non-responder 1.9