Prize-linked savings initiatives for promoting better health and economic outcomes in Kenya (the Akiba Study)
Last registered on December 21, 2018


Trial Information
General Information
Prize-linked savings initiatives for promoting better health and economic outcomes in Kenya (the Akiba Study)
Initial registration date
August 08, 2018
Last updated
December 21, 2018 11:16 PM EST
Primary Investigator
Harvard T. H. Chan School of Public Health
Other Primary Investigator(s)
PI Affiliation
Impact Research and Development Organization
PI Affiliation
University of Pennsylvania
Additional Trial Information
In development
Start date
End date
Secondary IDs
The project will assess the acceptability, feasibility, and potential impact of a novel prize-linked savings intervention designed to shift men’s income away from risky health behaviors and towards saving for the future in a community with continued high HIV incidence in Kenya. Prize-linked savings accounts have been in existence for many years in some countries and they offer savers a random, lottery-like payout proportional to the amount participants save, instead of traditional interest income. The project will enroll men who live in communities with high HIV risk, randomize them to the savings intervention, and assess changes in key economic and self-reported health outcomes over a 3-6 month period with baseline and follow-up surveys.
External Link(s)
Registration Citation
Agot, Kawango, Ellen Moscoe and Harsha Thirumurthy. 2018. "Prize-linked savings initiatives for promoting better health and economic outcomes in Kenya (the Akiba Study)." AEA RCT Registry. December 21.
Experimental Details
Intervention Start Date
Intervention End Date
Primary Outcomes
Primary Outcomes (end points)
1. Increase in savings balance: This is a binary variable equal to 1 if the respondent’s savings balance increased over the study period, and zero otherwise.
2. Change in savings balance over full study period: Similar to outcome 1, but a continuous measure of the net increase or decrease in savings balance over the study period.
3. Expenditures on alcohol
4. Participation in transactional sex
5. Expenditures on transactional sex
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
1. Savings: Net increase in both the savings balance and in self-reported total savings from all sources, in each lottery period and over the entire study period.
2. Expenditures on food items
3. Expenditures on non-food items
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Participants will be assigned to either a treatment group (prize linked savings) or control group (standard interest savings account) using individual-level random assignment.
Experimental Design Details
Randomization Method
Randomization done in office by a computer
Randomization Unit
Was the treatment clustered?
Experiment Characteristics
Sample size: planned number of clusters
300 individuals
Sample size: planned number of observations
300 individuals
Sample size (or number of clusters) by treatment arms
150 individuals
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
We aim to recruit a sample size sufficient to detect a 15 percentage point increase in probability of increasing the savings balance (binary outcome), with 80% power and alpha=0.05. The necessary sample size will be 200 participants if we assume that 10% of participants in the control groups will have an increase in savings between baseline and endline. With a sample size of 300 participants and 50% of participants in the control group having an increase in savings, we will by 80% power to detect a difference of ≥16 percentage points in the probability that savings increases due to the intervention.
IRB Name
Maseno University Ethics Review Committee
IRB Approval Date
IRB Approval Number
Post Trial Information
Study Withdrawal
Is the intervention completed?
Is data collection complete?
Data Publication
Data Publication
Is public data available?
Program Files
Program Files
Reports and Papers
Preliminary Reports
Relevant Papers