Information Provision and Elderly Vaccine Take-up

Last registered on December 26, 2025
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Pre-Trial

Trial Information

General Information

Title
Information Provision and Elderly Vaccine Take-up
RCT ID
AEARCTR-0017451
Initial registration date
December 11, 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
December 26, 2025, 2:02 AM EST

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

Locations

Country
China
Region

Primary Investigator

Name
Qingqing Zong
Affiliation
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Other Primary Investigator(s)

PI Name
Yuyu Chen
PI Affiliation
Peking University
Contact Investigator

Additional Trial Information

Status
Completed
Start date
2014-10-01
End date
2015-11-10
Keywords
Health
Additional Keywords
JEL code(s)
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
The experiment provides information provision intervention in the form of health workshops to part of participants of the experiment. The participants of the experiment are elderly Chronic obstructive pulmonary disease (COPD) patients. We examine how information provision intervention affects beliefs about vaccines, vaccine take-up behavior, and health status of participants of the experiment.
External Link(s)

Registration Citation

Citation
Chen, Yuyu and Qingqing Zong. 2025. "Information Provision and Elderly Vaccine Take-up." AEA RCT Registry. December 26. https://doi.org/10.1257/rct.17451-1.0
Sponsors & Partners
Experimental Details

Interventions

Intervention(s)
Intervention (Hidden)
Intervention Start Date
2014-11-10
Intervention End Date
2015-11-10

Primary Outcomes

Primary Outcomes (end points)
Beliefs about vaccines, vaccine take-up behavior, and health status
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
A total of about 900 COPD patients were included in the experiment, with one-half in the treatment group and the other half in the control group. The target population for the experiment was individuals aged 50 and above and had been identified as COPD patients by the local CDC authorities. Specifically, the sample of the experiment was from three selected national or provincial “Demonstration Units” for chronic disease management in Jinan, i.e. Shizhong District, Huaiyin District, and Tianqiao District. The randomization was conducted at the district level, and Shizhong District and Huaiyin District were assigned to the treatment group, and Tianqiao District was assigned to the control group. The information provision intervention in the treatment group was to organize health workshops for patients in the sample. During the health workshops, an 11-page slides were shown to the patients, containing information about vaccine effectiveness, side effects of vaccines, and disease threats. The information provision intervention was conducted by local general practitioners following a standard procedure.
Experimental Design Details
Randomization Method
The randomization was conducted at the district level, and Shizhong District and Huaiyin District were assigned to the treatment group, and Tianqiao District was assigned to the control group.
Randomization Unit
District
Was the treatment clustered?
Yes

Experiment Characteristics

Sample size: planned number of clusters
3 districts
Sample size: planned number of observations
About 900 individuals
Sample size (or number of clusters) by treatment arms
About 450 individuals in the treatment group, about 450 individuals in the control group
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Supporting Documents and Materials
IRB

Institutional Review Boards (IRBs)

IRB Name
IRB Approval Date
IRB Approval Number
Analysis Plan

Post-Trial

Post Trial Information

Study Withdrawal

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Intervention

Is the intervention completed?
No
Data Collection Complete
Data Publication

Data Publication

Is public data available?
No

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials