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Table 1 Response rates by study group

From: Improving response rates using a monetary incentive for patient completion of questionnaires: an observational study

Group

Historical controls (n = 105)

Payment (n = 442)

Difference in response rates (CI)

Initial mailing

39.0% (41/105)

53.8% (238/442)

14.8% (4.2 to 24.7)

1st reminder

26.6% (17/64)

40.8% (84/206)

14.2% (0.6 to 25.7)

2nd reminder

40.4% (19/47)

32.5% (38/117)

-7.9% (-24.2 to 7.6)

Telephone reminder

19.2% (5/26)

37.2% (29/78)

17.9% (-3.2 to 33.4)

Total

78.1% (82/105)

88.0% (389/442)

9.9% (2.3 to 19.1)