Can Cash Award Encourage Patients' Methadone Maintenance Treatment Attendance?
Last registered on April 20, 2021

Pre-Trial

Trial Information
General Information
Title
Can Cash Award Encourage Patients' Methadone Maintenance Treatment Attendance?
RCT ID
AEARCTR-0007568
Initial registration date
April 17, 2021
Last updated
April 20, 2021 6:31 AM EDT
Location(s)
Region
Primary Investigator
Affiliation
RIEM,Southwestern University of Finance and Economics
Other Primary Investigator(s)
PI Affiliation
Department of Economics, UCL
PI Affiliation
RIEM, Southwestern University of Finance and Economics
Additional Trial Information
Status
On going
Start date
2021-04-15
End date
2021-07-09
Secondary IDs
Abstract
Low retention rate of Methadone Maintenance Treatment (MMT) is a tough nut and research struggle to encourage patients to attend for MMT regularly. In this experiment, we encourage patients to overcome heroin addiction and maintain regular visit for MMT through group level and individual level cash award. In this context, we examine whether this MMT program (i) increases patients' attendance, (ii) changes patients' time preferences; (iii) improves patients' health condition; and lastly, (iv) improve patients' other living condition.
External Link(s)
Registration Citation
Citation
Carneiro, Pedro, Mengna Luan and Yiming Xia. 2021. "Can Cash Award Encourage Patients' Methadone Maintenance Treatment Attendance?." AEA RCT Registry. April 20. https://doi.org/10.1257/rct.7568-1.0.
Experimental Details
Interventions
Intervention(s)
We encourage the participants to attend for MMT regularly by cash incentives:
(1) cash award based on individual performance,
(2) cash award based on team performance
Intervention Start Date
2021-05-10
Intervention End Date
2021-06-09
Primary Outcomes
Primary Outcomes (end points)
MMT attendance, mental and physical health
Primary Outcomes (explanation)
We record patients' everyday MMT attendance, then we construct monthly attendance.
Secondary Outcomes
Secondary Outcomes (end points)
Employment status, Consumption and Time use
Secondary Outcomes (explanation)
Employment status: whether participants work, how much they earn.
Time use: work, housework, indoor and outdoor leisure
Experimental Design
Experimental Design
We recruit participants who is irregular MMT patients. The stratified randomization results in three treatment arms: (1) simple cash award based on participants' individual performance, (2) cash award based on team performance, as well as a (3) control. In the second treatment, the teams are formed randomly.

Experimental Design Details
For the outcomes, we test their time use, preference and mental health by questionnaires and collect adminstrative data to test their attendance.
Randomization Method
Randomization done in office by a computer
Randomization Unit
individual
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
330 patients
Sample size: planned number of observations
330 patients
Sample size (or number of clusters) by treatment arms
110 patients control , 110 patients cash award (individual) and 110 patients cash award (group)
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
2.5 days, unit and sd are about 90 people, s.d = 6, power 80%
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
West China Medical Center, Sichuan University
IRB Approval Date
2021-04-13
IRB Approval Number
K2021009
Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is 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