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Field
Trial End Date
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Before
March 31, 2026
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After
March 31, 2027
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Field
Last Published
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Before
March 12, 2025 09:46 AM
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After
February 13, 2026 01:16 PM
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Field
Intervention (Public)
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Before
Our intervention entails a roughly two-hour information session delivered to 10 randomly selected households in each village in the three information treatment arms (arms A, B and C). The information session consists of a standardized educational video - produced and delivered in the local languages, Wolof and Pulaar – that describes the water-access and schistosomiasis-reduction benefits of vegetation removal (“public health benefits”) or the crop productivity and profit benefits of vegetation removal (“private benefits”), respectively, in treatment arms A and B. Both educational videos are shown to participants in the third treatment (arm C), thereby combining the public health and private benefits information treatments to create a full 2x2 BACI design. Each training video also includes instruction about appropriate precautions to take to protect oneself from infection when clearing vegetation by wearing personal protection equipment (PPE). Participants are given an opportunity and trained in how to properly don the PPE during the session. In addition, those receiving the private benefits information session are also trained on how to effectively convert the vegetation to compost and use the compost for crop production.
In addition to the educational video, experts will be present to answer questions and foster discussion among attendees and a local farmer with experience using compost created from CR will be present to attest to the benefits in the private benefits arm, and a public health expert will attend the public benefits arm to answer questions and foster discussion among attendees. We will also provide two sets of personal protective equipment (namely, a pitchfork, chest waders with boots, and full-length gloves) to be shared among each group of 10 attendees in each information session. Lastly, we will give each information treatment participant a short questionnaire to assess understanding of the benefits, risks and methods of harvesting aquatic vegetation, use for compost (if applicable), and personal protection. Before they depart the training session, each participant is provided with a laminated handout to be taken home to remind them of the value of aquatic vegetation removal. We also follow up with monthly reminders via mobile phone messages for one year after the treatment, conveyed through the village relais communautaires (relays) - community contacts established for a range of purposes for communicating with government and outside nongovernmental agencies – or another individual designated by the group of 10 participants at the time of training. Each of the relays is given air time credit of FCFA5,000 (just over US$8) each month to cover their messaging costs. At endline, we will share information on both the private and public benefits with all sample households.
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After
Our intervention entails a roughly two-hour information session delivered to 10 randomly selected households in each village in the three information treatment arms (arms A, B and C). The information session consists of a standardized educational video - produced and delivered in the local languages, Wolof and Pulaar – that describes the water-access and schistosomiasis-reduction benefits of vegetation removal (“public health benefits”) or the crop productivity and profit benefits of vegetation removal (“private benefits”), respectively, in treatment arms A and B. Both educational videos are shown to participants in the third treatment (arm C), thereby combining the public health and private benefits information treatments to create a full 2x2 BACI design. Each training video also includes instruction about appropriate precautions to take to protect oneself from infection when clearing vegetation by wearing personal protection equipment (PPE). Participants are given an opportunity and trained in how to properly don the PPE during the session. In addition, those receiving the private benefits information session are also trained on how to effectively convert the vegetation to compost and use the compost for crop production.
In addition to the educational video, experts will be present to answer questions and foster discussion among attendees and a local farmer with experience using compost created from CR will be present to attest to the benefits in the private benefits arm, and a public health expert will attend the public benefits arm to answer questions and foster discussion among attendees. We will also provide two sets of personal protective equipment (namely, a pitchfork, chest waders with boots, and full-length gloves) to be shared among each group of 10 attendees in each information session. Lastly, we will give each information treatment participant a short questionnaire to assess understanding of the benefits, risks and methods of harvesting aquatic vegetation, use for compost (if applicable), and personal protection. Before they depart the training session, each participant is provided with a laminated handout to be taken home to remind them of the value of aquatic vegetation removal. We also follow up with monthly reminders via mobile phone messages for one year after the treatment, conveyed through the village relais communautaires (relays) - community contacts established for a range of purposes for communicating with government and outside nongovernmental agencies – or another individual designated by the group of 10 participants at the time of training. Each of the relays is given air time credit of FCFA5,000 (just over US$8) each month to cover their messaging costs. At endline, we will share information on both the private and public benefits with all sample households.
Midline data collection completed in February 2025 established that the original intervention, based on a short video-based training of individuals, had no measurable impact in any treatment arm. Tapping additional financial resources newly available, we plan a new intervention that maintains the same experimental design in terms of control and treatment arms, but now deploys a facilitator to work with treatment village community members intensively at least once per month to try to encourage submerged aquatic vegetation removal following the motivations appropriate to the village’s treatment arm. We explain the new intervention in an amended pre-analysis plan filed here. What was to have been the endline household survey now becomes the midline 2 survey, de facto the baseline to the new, more intensive interventions. We also fielded new cognitive and learning assessments among primary school aged children – regardless of whether or not they attend school – in the midline 2 survey round and introduced new primary and secondary outcomes associated with those new data collection instruments.
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Field
Intervention End Date
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Before
May 15, 2024
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After
January 01, 2027
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Field
Primary Outcomes (End Points)
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Before
Household-level cerato removal and water point-level cerato removal; agricultural productivity; schistosomiasis infections; children's school participation
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After
Household-level cerato removal and water point-level cerato removal; agricultural productivity; schistosomiasis infections; children's school participation; children's performance on cognitive and/or learning assessments
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Field
Primary Outcomes (Explanation)
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Before
See pre-analysis plan for full details (amended in March 2025)
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After
See pre-analysis plan for full details (amended in February 2026)
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Field
Experimental Design (Public)
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Before
See pre-analysis plan for full details (amended in March 2025)
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After
See pre-analysis plan for full details (amended in February 2026)
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Field
Randomization Unit
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Before
households randomized into treatment within a village cluster (there are local control households within the treated villages, as well as pure control villages where no household gets treated).
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After
households randomized into treatment within a village cluster (there are local control households within the treated villages, as well as pure control villages where no household gets treated). Village clusters randomized into treatment arms.
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
see pre-analysis plan (amended in March 2025)
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After
See pre-analysis plan for full details (amended in February 2026)
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Field
Secondary Outcomes (End Points)
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Before
See pre-analysis plan for full details
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After
See pre-analysis plan for full details (amended in February 2026)
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Field
Secondary Outcomes (Explanation)
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Before
See pre-analysis plan for full details
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After
See pre-analysis plan for full details (amended in February 2026)
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