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Demand for Ultrasonography: Roles of Price Framing and Sex Information
Last registered on August 20, 2019

Pre-Trial

Trial Information
General Information
Title
Demand for Ultrasonography: Roles of Price Framing and Sex Information
RCT ID
AEARCTR-0004598
Initial registration date
August 20, 2019
Last updated
August 20, 2019 9:33 AM EDT
Location(s)

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Primary Investigator
Affiliation
University of Hong Kong
Other Primary Investigator(s)
PI Affiliation
Cornell University
PI Affiliation
Cornell University
Additional Trial Information
Status
On going
Start date
2019-07-01
End date
2019-11-30
Secondary IDs
Abstract
In this proposed study, we examine the roles of price framing and fetal sex information on demand for obstetric ultrasonography. Specifically, we examine the effects of framing of price information (subsidy versus price discount) and provision of fetal sex information on willingness to pay for ultrasonography of pregnant women. We implement a randomized control trial in the context of rural Malawi in which access to obstetric ultrasonography is severely limited.
External Link(s)
Registration Citation
Citation
Kim, Hyuncheol Bryant, Sangyoon Park and Hyuk Son. 2019. "Demand for Ultrasonography: Roles of Price Framing and Sex Information." AEA RCT Registry. August 20. https://doi.org/10.1257/rct.4598-1.0.
Sponsors & Partners

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Experimental Details
Interventions
Intervention(s)
The main intervention is to provide ultrasonography to pregnant women visiting health clinics for antenatal care. We randomize the price framing scheme and provision of fetal sex information across health clinics and, in case of revisiting health centers, across different dates. In addition, we randomize the actual price each participant has to pay to receive one ultrasonography treatment on the day of their visit. Participants’ demands will be measured using a multiple price list Becker-DeGroot-Marschak (BDM) mechanism.
Intervention Start Date
2019-07-01
Intervention End Date
2019-11-30
Primary Outcomes
Primary Outcomes (end points)
Each participant’s willingness to pay for ultrasonography service and post-treatment behavior
Primary Outcomes (explanation)
Willingness to pay for ultrasonography will be measured using a multiple price list BDM consisting of eleven different subsidy (or price) levels. Information on post-treatment behavior will be collected through a follow-up survey which will ask participants about their recent health and prenatal care investment activities.
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
In this study, we employ a two-stage randomized control trial. In the first stage, type of intervention is randomly assigned into one of the four groups which changes across days: 1) price salient, reveal fetal sex information, 2) price salient, do not reveal fetal sex information, 3) subsidy salient, reveal fetal sex information, and 4) subsidy salient, do not reveal fetal sex information. In the second stage, given the first stage intervention, each participant randomly draws a price tag indicating the actual subsidy (price) for receiving ultrasonography. We employ a multiple price list BDM such that prior to making the draw in the second stage participants will make purchase decisions on all eleven subsidy (price) levels.
Experimental Design Details
Not available
Randomization Method
We employ a two-stage randomized trial design. First stage randomization of price framing and fetal sex information provision is conducted using researcher’s laptop before start of project. Second stage randomization of actual subsidy (price) level is determined by each participant’s draw from a random lottery right after the multiple price list BDM survey session.
Randomization Unit
Price framing and fetal sex information is randomized at the date-facility level. Actual price (or subsidy, depending on the first-stage treatment outcome) level is randomized at the individual level.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
2,400 pregnant women
Sample size: planned number of observations
2,400 pregnant women
Sample size (or number of clusters) by treatment arms
600 in price salient, reveal fetal sex information group, 600 in price salient, do not reveal fetal sex information group, 600 in subsidy salient, reveal fetal sex information group, and 600 in subsidy salient, do not reveal fetal sex information group
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
Universiy of Hong Kong
IRB Approval Date
2019-08-08
IRB Approval Number
EA1906008
IRB Name
Cornell University
IRB Approval Date
2019-06-24
IRB Approval Number
1905008831
Analysis Plan

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