To send or not to send: weighing the costs and benefits of mailing an advance letter to participants before a telephone survey

A letter was mailed to half the participants (Letter  = 137; No Letter = 138) of a 5-year follow-up survey regarding smoking cessation before attempting contact for a telephone interview. The primary outcome wa...

Source: BMC Research Notes - November 15, 2018 Category: Research Authors: Christina Schell, Alexandra Godinho, Vladyslav Kushnir and John A. Cunningham Tags: Research note Source Type: research