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Impact Evaluation on the Distribution of Plastic Latrine Slabs and Improving Households Sanitation in Rural Kenya
Last registered on April 07, 2017

Pre-Trial

Trial Information
General Information
Title
Impact Evaluation on the Distribution of Plastic Latrine Slabs and Improving Households Sanitation in Rural Kenya
RCT ID
AEARCTR-0002133
Initial registration date
April 07, 2017
Last updated
April 07, 2017 6:59 PM EDT
Location(s)
Primary Investigator
Affiliation
Aquaya
Other Primary Investigator(s)
PI Affiliation
Ministry of Health, Nairobi, Kenya
PI Affiliation
World Bank, Nairobi, Kenya
PI Affiliation
Kenya Medical Research Institute, Nairobi, Kenya
PI Affiliation
University of Barcelona, Barcelona, Spain
PI Affiliation
World Bank, Nairobi, Kenya
PI Affiliation
Water Practice, World Bank, Washington DC
Additional Trial Information
Status
On going
Start date
2015-03-01
End date
2020-03-01
Secondary IDs
Abstract
Over two-thirds of Kenyans lack access to improved sanitation, a significant public health burden that costs the country nearly one percent of its GDP every year. In order to support acceleration of access to improved sanitation in Kenya, the World Bank is working directly with large plastics manufacturing firms, grassroots and local MFIs, local retailers, and the government to design, test, and support market development and distribution strategies for a range of plastic latrine slabs.

The objective of this impact evaluation is to learn whether niche distribution and financing mechanisms are effective for reaching the base-of-the-pyramid and to evaluate health impact and cost-effectiveness of plastic latrine slabs. This study is being conducted in Busia and Nyeri counties of Kenya, where the Water and Sanitation Program of the World Bank is implementing the Selling Sanitation initiative jointly with International Finance Corporation. A key outcome of the study will be to inform future strategies of reaching households at the base of the pyramid with improved sanitation products.
External Link(s)
Registration Citation
Citation
Chase, Claire et al. 2017. "Impact Evaluation on the Distribution of Plastic Latrine Slabs and Improving Households Sanitation in Rural Kenya." AEA RCT Registry. April 07. https://doi.org/10.1257/rct.2133-1.0.
Former Citation
Chase, Claire et al. 2017. "Impact Evaluation on the Distribution of Plastic Latrine Slabs and Improving Households Sanitation in Rural Kenya." AEA RCT Registry. April 07. http://www.socialscienceregistry.org/trials/2133/history/16024.
Experimental Details
Interventions
Intervention(s)
Intervention Start Date
2015-03-01
Intervention End Date
2020-03-01
Primary Outcomes
Primary Outcomes (end points)
- Coverage (uptake) of plastic latrine slabs
- Willingness-to-pay of plastic latrine slabs
- Health outcomes: diarrheal prevalence and weight-for-age z-scores (WAZ) for children under five
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
The impact evaluation uses an experimental approach, consisting of a three-arm cluster randomized controlled trial (RCT) with random assignment at village/cluster level. The three arms are as follows:
1. Distribution and financing arm: Grassroots savings and investment groups offer direct sales and financing to consumers, to examine market penetration and sales of plastic slabs.
2. Health arm: Households are provided with plastic slabs to test the efficacy of the slabs on health outcomes.
3. Control arm: Manufacturers of the plastic slabs are free to distribute through existing channels, but without support for setting up these new channels of distribution.
Experimental Design Details
Not available
Randomization Method
Computer generated
Randomization Unit
Village
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
184
Sample size: planned number of observations
3915 households
Sample size (or number of clusters) by treatment arms
1. Distribution and financing arm: 450 households in 30 villages
2. Health arm: 1540 households in 77 villages
3. Control arm: 1925 households in 77 villages
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
AMREF Ethics and Scientific Review Committee
IRB Approval Date
2015-01-27
IRB Approval Number
AMREF-ESRC P155/2014