An advance letter did not increase the response rates in a telephone survey: a randomized trial.


OBJECTIVE To test the impact of an advance letter on response and cooperation rates in a nationwide telephone survey, given previous inconsistent results. STUDY DESIGN AND SETTING Within the context of a larger telephone survey, 1,000 Australian households were randomly selected to take part in this trial. Half were randomly allocated to receive an… (More)
DOI: 10.1016/j.jclinepi.2013.03.007


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