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Table 5 Preliminary results*: the patient questionnaire response rates

From: Pragmatic trials in primary care. Methodological challenges and solutions demonstrated by the DIAMOND-study

N = 664*

Baseline

2 weeks

After step 1

After step 2#

After step 3#

6 months

1 year

Sent out

664*

613*

643*

595*

587*

659*

566*

Returned

629

543

525

474

454

646

373

Response rate

95%

86%

82%

80%

77%

98%

66%^

  1. * Not all follow-up questionnaires were sent out, for instance when patients started step 2 within 2 weeks, or patients reported they no longer whish to receive questionnaires.
  2. # if medication of this step was not started, questionnaires were sent out at 2 resp. 3 months.
  3. ^In case of non-response a reminder is sent out after all questionnaires except after 1-year, since this is an additional measurement to the original research protocol. This explains the low response rate.