War Trauma, Trust, Occupation and Collaboration in Ukraine

Last registered on March 26, 2025
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Pre-Trial

Trial Information

General Information

Title
War Trauma, Trust, Occupation and Collaboration in Ukraine
RCT ID
AEARCTR-0015627
Initial registration date
March 22, 2025

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
March 26, 2025, 9:42 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Locations

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Primary Investigator

Name
Gwendolyn Sasse
Affiliation
Centre for East European and International Studies (ZOiS) and Humboldt Universität zu Berlin
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Other Primary Investigator(s)

PI Name
Henry Hale
PI Affiliation
George Washington University
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PI Name
Olga Onuch
PI Affiliation
University of Manchester
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PI Name
Volodymyr Kulyk
PI Affiliation
Kyiv School of Economics
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PI Name
Deirdre MacManus
PI Affiliation
KIng's College London
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Additional Trial Information

Status
On going
Start date
2025-03-07
End date
2025-12-31
Keywords
Behavior, Crime, Violence, & Conflict, Health, Post-conflict
Additional Keywords
war, Ukraine, Russia, occupation, resistance, collaboration, trauma, PTSD/CPTSD, trust, national unity
JEL code(s)
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
This study employs a randomized controlled trial (RCT) in order to improve our understanding of how protracted all-out war influences identities (esp. national unity) and attitudes (esp. social trust and punitive measures for collaboration) in a country that is the victim of aggression. A particular focus is the role of trauma (PTSD and Complex PTSD) moderating war effects.
External Link(s)

Registration Citation

Citation
Hale, Henry et al. 2025. "War Trauma, Trust, Occupation and Collaboration in Ukraine." AEA RCT Registry. March 26. https://doi.org/10.1257/rct.15627-1.0
Sponsors & Partners

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Experimental Details

Interventions

Intervention(s)
This study includes one RCT
Intervention Start Date
2025-03-07
Intervention End Date
2025-04-07

Primary Outcomes

Primary Outcomes (end points)
The primary outcomes of interest are two questions: one capturing a sense of national unity and willingness to move on from the past, and another one capturing the wish to expose and punish those who did not resist the occupiers.
Primary Outcomes (explanation)
The outcomes of primary interest are the differences, on each outcome question, between the groups receiving the treatments and each treatment compared to the control group.

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The experiment is embedded in the second round of a telephone (CATI) panel survey conducted by the Kyiv International Institute of Sociology (KIIS).
Experimental Design Details
Not available
Randomization Method
Randomization in the assignment of respondents to control and treatment groups is achieved through the randomization function in KIIS’s survey software.

Randomization Unit
Individual
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
0
Sample size: planned number of observations
Approximately 1200 adult residents of Ukraine
Sample size (or number of clusters) by treatment arms
Approximately 300 in each of three randomly assigned groups
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials
IRB

Institutional Review Boards (IRBs)

IRB Name
Joint Ethics Commission (IFL, ZOiS et al.)
IRB Approval Date
2025-02-05
IRB Approval Number
1/2024
Analysis Plan

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