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Covid-19 Vaccination Intentions and Prosocial Motives

Last registered on August 06, 2021


Trial Information

General Information

Covid-19 Vaccination Intentions and Prosocial Motives
Initial registration date
August 05, 2021

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
August 06, 2021, 7:01 AM EDT

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



Primary Investigator

Jinan University

Other Primary Investigator(s)

PI Affiliation
Seoul National University
PI Affiliation
Aix-Marseille School of Economics
PI Affiliation
Centre for Economic Research in Pakistan

Additional Trial Information

In development
Start date
End date
Secondary IDs
In this study, we aim to understand the nature of prosocial motives in decisions to vaccinate against Covid-19 through information provision experiment. Different statements will focus on prosocial motives of vaccination by highlighting benefits of vaccination, or by highlighting social loss when not vaccinating. Also, each statement will be combined with strategic concerns that promote self-interest, to separate prosocial concerns from selfish, strategic concerns. This study will illuminate the nature of vaccine hesitancy in the context of a major developing country, where evidence remains relatively scarce in the literature. Furthermore, our study will contribute to the literature by showing the effects of social gain and social loss framing on individual choice.
External Link(s)

Registration Citation

Ali, Bakhtawar et al. 2021. "Covid-19 Vaccination Intentions and Prosocial Motives." AEA RCT Registry. August 06.
Experimental Details


We conduct a computer-assisted phone survey on 3,000 men and women between ages of 25 and 65 in Pakistan. The survey will take approximately 10 to 15 minutes. Respondents will answer provide information on demographic information and their opinions and beliefs regarding the seriousness of the Covid-19 and the efficacy of the vaccines. After being randomly provided with statements highlighting benefits of vaccination (or costs of not getting vaccinated), respondents will state their intention to be vaccinated as a percentage in hypothetical situations where vaccines are provided for a fee and where others in the neighborhood also received vaccination. Their altruism, strategic thinking, and trust of institutions will also be elicited using dedicated measures.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Self-reported probability of choosing to vaccinate against Covid-19 when given an opportunity to do so.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Experiment is conducted in five arms where one arm is control. Participants in the other arms are given statements about Covid-19 vaccine that highlight (a) prosocial motives through altruism; (b) prosocial motives through altruism with strategic concern; (c) prosocial motives through guilt; and (d) prosocial motives through guilt with strategic concern.
Experimental Design Details
Randomization Method
Randomization is done in office by a computer at the beginning of the survey.
Randomization Unit
Randomization is conducted at individual level.
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
3000 individuals
Sample size: planned number of observations
3000 individuals
Sample size (or number of clusters) by treatment arms
600 in each of the five survey arms
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Seoul National University IRB
IRB Approval Date
IRB Approval Number
IRB No. 2107/001-006


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Collection Completion Date
Final Sample Size: Number of Clusters (Unit of Randomization)
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
Final Sample Size (or Number of Clusters) by Treatment Arms
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials