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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