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Social Image Concerns of Blood Donors
Last registered on October 29, 2019

Pre-Trial

Trial Information
General Information
Title
Social Image Concerns of Blood Donors
RCT ID
AEARCTR-0004890
Initial registration date
October 28, 2019
Last updated
October 29, 2019 9:47 AM EDT
Location(s)

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Primary Investigator
Affiliation
European University Institute
Other Primary Investigator(s)
PI Affiliation
University of Bonn
Additional Trial Information
Status
In development
Start date
2019-10-29
End date
2020-12-30
Secondary IDs
Abstract
We study experimentally the role of social image concerns for blood donors.
External Link(s)
Registration Citation
Citation
Goette, Lorenz and Egon Tripodi. 2019. "Social Image Concerns of Blood Donors." AEA RCT Registry. October 29. https://doi.org/10.1257/rct.4890-1.0.
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Experimental Details
Interventions
Intervention(s)
Field experiment in collaboration with Italian NGO to study short and long term effects of social recognition.
Intervention Start Date
2019-10-29
Intervention End Date
2020-11-30
Primary Outcomes
Primary Outcomes (end points)
Blood donations made in November 2019
Plasma donations made in November 2019
Blood donations made in November 2020
Plasma donations made in November 2020
Primary Outcomes (explanation)
To assess the short [long] term effects of visibility incentives on blood (plasma) donations we compare blood (plasma) donations made in November 2019 [2020] between treatments ii and iv (iii and v).
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
We will look into whether treatment effects are stronger
- for women than for men;
- for inactive donors (those who have not donated in the last 24 months) than for active donors.
Experimental Design
Experimental Design
The experiment randomizes whether registered blood donors are offered a public acknowledgment on social media for donating blood in a certain period of time.
Experimental Design Details
Not available
Randomization Method
randomization done in office by a computer
Randomization Unit
Some of the treatments are randomized across clusters, and some treatments are randomized within clusters.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
65 local branches of the NGO
Sample size: planned number of observations
about 15,000 blood donors
Sample size (or number of clusters) by treatment arms
For the main treatments, we have about 20 clusters per treatment with about 5,000 donors each.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
German Association for Experimental Economic Research e.V.
IRB Approval Date
2019-10-28
IRB Approval Number
jN7oi2yd