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The effect of different written appeals on hand disinfection in supermarkets
Last registered on June 22, 2020

Pre-Trial

Trial Information
General Information
Title
The effect of different written appeals on hand disinfection in supermarkets
RCT ID
AEARCTR-0006034
Initial registration date
June 20, 2020
Last updated
June 22, 2020 11:52 AM EDT
Location(s)

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Primary Investigator
Affiliation
University of Bern
Other Primary Investigator(s)
PI Affiliation
University of Bern
PI Affiliation
University of Bern
Additional Trial Information
Status
In development
Start date
2020-05-10
End date
2021-12-31
Secondary IDs
Abstract
In light of the current Covid-19 crisis, disinfecting one's hands before entering a store became a standard procedure in Switzerland, and stores commonly provide dispensers in the entrance area. So far, only little is known on how to effectively get customers to adopt this relatively new behavior as part of their shopping routine.

In a field experiment, we examine how different written appeals affect the willingness of customers to disinfect their hands prior to / when entering a supermarket.
External Link(s)
Registration Citation
Citation
Jaussi, Stefanie, Anna Corinna Kulle and Frauke von Bieberstein. 2020. "The effect of different written appeals on hand disinfection in supermarkets." AEA RCT Registry. June 22. https://doi.org/10.1257/rct.6034-1.0.
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2020-06-24
Intervention End Date
2020-08-31
Primary Outcomes
Primary Outcomes (end points)
Share of people disinfecting their hands prior to entering a supermarket. We will control for individual observable differences (gender and age group) and for data provided by the supermarket chain (e.g. average amount spent, number of customers present). We will consider all experimental days and make a first day analysis.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
We conduct a field experiment with two experimental treatments and a control treatment.
Experimental Design Details
Not available
Randomization Method
Randomization over morning, lunch to early afternoon, and late afternoon to evening (ABC/BCA/CAB-design) on three consecutive days in three supermarkets. The randomization was done at the office by rolling a die.
Randomization Unit
Customers shopping at a specific time of the day (morning, lunch to early afternoon, and late afternoon to evening) in one of the three supermarkets.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
no clusters
Sample size: planned number of observations
In total about 7’000-12’000 participants across the two experimental and the one control condition, depending on how many people visit the three stores on the three treatment days.
Sample size (or number of clusters) by treatment arms
About 2’300-4’000 participants per treatment, depending on how many people visit the three stores on the three treatment days.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Ethics Committee University of Bern, Faculty of Business, Economics and Social Sciences
IRB Approval Date
2020-06-03
IRB Approval Number
072020