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Randomized Controlled Trial
. 2011 Jun 28;108(26):10415-20.
doi: 10.1073/pnas.1103170108. Epub 2011 Jun 13.

Using implementation intentions prompts to enhance influenza vaccination rates

Katherine L Milkman  1 , John Beshears, James J Choi, David Laibson, Brigitte C Madrian
Affiliations
Randomized Controlled Trial

Using implementation intentions prompts to enhance influenza vaccination rates

Katherine L Milkman et al. Proc Natl Acad Sci U S A. .

Abstract

We evaluate the results of a field experiment designed to measure the effect of prompts to form implementation intentions on realized behavioral outcomes. The outcome of interest is influenza vaccination receipt at free on-site clinics offered by a large firm to its employees. All employees eligible for study participation received reminder mailings that listed the times and locations of the relevant vaccination clinics. Mailings to employees randomly assigned to the treatment conditions additionally included a prompt to write down either (i) the date the employee planned to be vaccinated or (ii) the date and time the employee planned to be vaccinated. Vaccination rates increased when these implementation intentions prompts were included in the mailing. The vaccination rate among control condition employees was 33.1%. Employees who received the prompt to write down just a date had a vaccination rate 1.5 percentage points higher than the control group, a difference that is not statistically significant. Employees who received the more specific prompt to write down both a date and a time had a 4.2 percentage point higher vaccination rate, a difference that is both statistically significant and of meaningful magnitude.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Experimental component of reminder mailer sent to study participants.
Fig. 2.
Fig. 2.
Vaccination rates by experimental condition and flu shot clinic length.
Fig. 3.
Fig. 3.
Flow of study participants.
See this image and copyright information in PMC

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