A photograph of the researcher on the invitation letter did not affect the participation rate of a postal survey: a randomized study within a trial (SWAT)

Objective Participant recruitment is one of the main challenges in research. It is suggested that including researcher photographs might increase participation rates, but empirical evidence is lacking. This study within a trial (SWAT) aims to assess whether invitation letters including researcher ph...

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Bibliographic Details
Published in:BMC medical research methodology 2022-09, Vol.22 (1), p.1-249, Article 249
Main Authors: Prediger, Barbara, Könsgen, Nadja, Bora, Ana-Mihaela, Schlimbach, Anna, Pieper, Dawid
Format: Article
Language:English
Subjects:
Customization
Enhancement strategies
Health education
Health literacy
Images, Photographic
Influence
Intervention
Management
Medical research
Medical research personnel
Methodology
Participation
Participation rate
Personalization
Population
Questionnaires
Recruitment
Registration
Response rates
Rural areas
Sociodemographics
Study within a trial
Vocational education
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Summary:Objective Participant recruitment is one of the main challenges in research. It is suggested that including researcher photographs might increase participation rates, but empirical evidence is lacking. This study within a trial (SWAT) aims to assess whether invitation letters including researcher photographs increase the participation rate in the context of a survey on medical second opinions. Methods Through 25 local register offices in Berlin and Brandenburg (Germany), we identified a random sample of 9990 persons. We randomly assigned our sample to the intervention group (IG) receiving an invitation letter with researcher photographs and control group (CG) receiving an invitation letter without photographs in a 1:1 ratio. Our primary outcome was the participation rate. Furthermore, we compared participants to non-participants' characteristics. Results Of 9990 invitations, 9797 could be delivered (IG: 4890, CG: 4907). Of these, 1349 (13.8%) participated. There were 682/4890 (13.9%) participants in the IG and 662/4907 (13.5%) in the CG with an odds ratio of 1.030 (95% confidence interval: 0.918-1.156). Additional analyses on non-participant characteristics did not show any differences. Conclusion We could not find any difference in the participation rates. Our study does not confirm the results of previous studies. The length of our questionnaire may have affected our results. Trial registration Queens University Belfast - SWAT Store, SWAT 104. Keywords: Recruitment, Participation rate, Enhancement strategies, Study within a trial, Personalization
ISSN:1471-2288
1471-2288
DOI:10.1186/s12874-022-01717-3