From: Do incentives, reminders or reduced burden improve healthcare professional response rates in postal questionnaires? two randomised controlled trials
Full questionnaire
Postcard
N = 425
N = 422
n
%
Completed questionnaires returned
44
10.4
31
7.3
Absolute percent difference (95% CI) ; p-value
3 (−0.1 , 6.8); 0.12