Implementación de un chatbot basado en estrategias comportamentales para fomentar la continuidad de la vacunación contra el COVID-19: un ensayo controlado aleatorio

Last registered on July 21, 2022

Pre-Trial

Trial Information

General Information

Title
Implementación de un chatbot basado en estrategias comportamentales para fomentar la continuidad de la vacunación contra el COVID-19: un ensayo controlado aleatorio
RCT ID
AEARCTR-0009758
Initial registration date
July 15, 2022

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
July 21, 2022, 11:33 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

Affiliation
The Behavioral Insights Team

Other Primary Investigator(s)

PI Affiliation
Government of Argentina, Behavioural Science and Public Policy Unit.
PI Affiliation
Universidad Favaloro
PI Affiliation
ECOM Chaco
PI Affiliation
The Behavioral Insights Team
PI Affiliation
The Behavioral Insights Team
PI Affiliation
The Behavioral Insights Team
PI Affiliation
The Behavioral Insights Team

Additional Trial Information

Status
In development
Start date
2022-07-18
End date
2022-12-31
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Despite overwhelming medical evidence on the protection offered by second, third and fourth Covid-19 vaccine doses, uptake of these doses remains low in Chaco province, Argentina, even though the vaccine is in ready supply. Several factors may account for this low uptake, including friction costs, intention-behaviour gaps, and lower perception of risk from Covid-19 compared to previous moments of the pandemic. Interactive communication via chatbot may help address these barriers and promote vaccination. In this randomized controlled trial, participants in the intervention group will receive personalized Whatsapp chatbot messages informing them that they are eligible for the next dose, sharing practical information on when and where to get vaccinated, providing planning prompts and enabling them to set reminders to get their next dose of the vaccine on a convenient date. Vaccination outcomes for participants in the intervention group will be compared with those of participants receiving a simple non-chatbot reminder message and of participants receiving no message.
External Link(s)

Registration Citation

Citation
Barrera, Adelaida et al. 2022. "Implementación de un chatbot basado en estrategias comportamentales para fomentar la continuidad de la vacunación contra el COVID-19: un ensayo controlado aleatorio." AEA RCT Registry. July 21. https://doi.org/10.1257/rct.9758-1.0
Sponsors & Partners

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Experimental Details

Interventions

Intervention(s)
Participants will receive personalized Whatsapp chatbot messages informing them they are eligible for the next dose, sharing practical information on when and where to get vaccinated, providing planning prompts, and enabling them to set reminders to get their next dose of the Covid-19 vaccine on a convenient date.
Intervention Start Date
2022-07-19
Intervention End Date
2022-12-31

Primary Outcomes

Primary Outcomes (end points)
‘Next dose’ Covid-19 vaccination rate within four weeks.
Primary Outcomes (explanation)
The primary outcome variable (next dose vaccination rate) is a binary variable indicating whether the individual received the next dose for which they are eligible within four weeks of entering the trial. This variable will be created using administrative data provided by the Ministry of Health which includes information on the date of vaccination.

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We will conduct a Randomized Controlled Trial (RCT) with three trial arms (an interactive chatbot, a simple message reminder, and a pure control group who receives no message).
Experimental Design Details
Not available
Randomization Method
Participants will be allocated to a trial arm using simple randomisation at the individual-level, using the participants’ mobile number as their unique identifier.
Randomization Unit
The randomization unit is the individual.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
241,435 individuals
Sample size: planned number of observations
241,435 individuals
Sample size (or number of clusters) by treatment arms
The sample will be split evenly between groups: 80,478 individuals in each of the three trial arms (chatbot, simple message reminder, no message).
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Baseline rate: 3.8% S.D.: N/A MDES unit: 0.32 percentage points MDES percentage: 8.4%
Supporting Documents and Materials

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IRB

Institutional Review Boards (IRBs)

IRB Name
Comité de Bioética, Fundación Favaloro Hospital Universitario
IRB Approval Date
2022-06-29
IRB Approval Number
DNE 297/2020, Acta Nº 121; CCE: Nº 015; RENIS: Nº 000042; DHHS/OHRP: 00004573