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Field
Last Published
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Before
December 28, 2025 08:07 AM
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After
December 29, 2025 08:52 AM
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Field
Experimental Design (Public)
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Before
Experimental Design
The experimental design involves a Randomized Controlled Trial (RCT) to assess the impact of the Tharaka Nithi County Preschool Program on child development and women's labor supply. The intervention targets 3–4-year-olds, utilizing the existing infrastructure of PP1 (pre-primary 1) in selected public schools. The study duration is planned for two years, starting in the school calendar year beginning January 2023.
We will select 117 schools in Tharaka Nithi county in Kenya based on: a) their ability to accommodate 5 extra children in their preschool class (PP1 - currently for four year-olds only); b) that do not have a playgroup for children younger than 4; c) do not admit regularly 3-year-olds.
Determining the 3-year olds that will participate in the study: Following a census we consider all 3-year-olds defined as children who will be between 2y8mo-3y6mo in January 2024. We then allocate 10 children and 5 reserve children to the closest possible school of the 117 study schools such that each school is associated with 10 children and five reserve children to fill in the place of those who turn down participation in the study.
We then randomly select 60 schools into treatment. For each treatment school we randomly select 5 children from the group associated with the school (as above) to attend to attend the school. The other five will be controls. Children associated with control schools are also controls. Once parents have consented, these children are assessed, and household data is collected.
4-year-olds attend preschool (PP1) anyway: This is the current age of first attendance. Thus, once school has started in January 2024 we obtain the register of all 4-year-old children in all 117 study schools. We then randomly pick 5 4-year-olds from the list to be the children we observe for the study. Once parents have consented, these children are assessed, and household data is collected.
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After
Experimental Design
The experimental design involves a Randomized Controlled Trial (RCT) to assess the impact of the Tharaka Nithi County Preschool Program on child development and women's labor supply. The intervention targets 3–4-year-olds, utilizing the existing infrastructure of PP1 (pre-primary 1) in selected public schools. The study duration is planned for two years, starting in the school calendar year beginning January 2023.
There will be two experimental cohorts. Cohort 1 recruited in January 2024, following a census on October-December 2023 and Cohort 2 recruited in September - November 2024. The treatment group of Cohort 1 will be subject to the intervention from January 2024 to October 2024, while the treatment group cohort 2 will be subject to intervention from January 2025 to October 2025. data collection will follow the end of the intervention respectively for both cohorts.
Experimental Design:
There are 149 potentially eligible schools, based on capacity to receive new children and on the fact that they do not include playgroups or regular attendance of three year olds. The census determined that 118 include enough eligible families within their catchment areas. Of these 60 were allocated to treatment and 58 to control.
Cohort 1: Randomization will take place by computer following a census of eligible households (those with children 2y8mo-4y5Mo at baseline who have expressed willingness to participate) within a radius of 3km from the 118 schools. Within the 3km catchment area of the schools 15 children will be selected and their families consented for the intervention and data collection. Following this, within the catchment group of the 60 treatment schools 5 children are randomly admitted to the treatment schools and another 5 are randomly selected as controls within the same communities. Within the catchment area of the control schools 5 children and their families are randomly selected for observation. Data is collected from the families (mother and father - when present), the schools and the children (assessments) at both baseline and end of intervention. In addition within each schools (treatment and control) 5 4-year olds are recruited. They are also subject to the intervention, since they are in the same classrooms as the 3-year-olds. However, the non-treated 4-year-olds are still attending PP1 class but in a non-treated school
Cohort 2: The same treatment and control schools are involved. Only 3 year olds are recruited (2y8mo-4y5Mo at baseline). We identify the 5 closest consenting families with 3-year-olds to each of the treatment schools. If it is a treatment school, the 5 children are admitted to the PP1 in that school. The five children and their families in the radius of the control school are kept for observation. Consenting takes place before treatment status is revealed.
We will select 117 schools in Tharaka Nithi county in Kenya based on: a) their ability to accommodate 5 extra children in their preschool class (PP1 - currently for four year-olds only); b) that do not have a playgroup for children younger than 4; c) do not admit regularly 3-year-olds.
Determining the 3-year olds that will participate in the study: Following a census we consider all 3-year-olds defined as children who will be between 2y8mo-3y6mo in January 2024. We then allocate 10 children and 5 reserve children to the closest possible school of the 117 study schools such that each school is associated with 10 children and five reserve children to fill in the place of those who turn down participation in the study.
We then randomly select 60 schools into treatment. For each treatment school we randomly select 5 children from the group associated with the school (as above) to attend to attend the school. The other five will be controls. Children associated with control schools are also controls. Once parents have consented, these children are assessed, and household data is collected.
4-year-olds attend preschool (PP1) anyway: This is the current age of first attendance. Thus, once school has started in January 2024 we obtain the register of all 4-year-old children in all 117 study schools. We then randomly pick 5 4-year-olds from the list to be the children we observe for the study. Once parents have consented, these children are assessed, and household data is collected.
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Field
Randomization Method
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Before
Randomization will take place by computer following a census of eligible households (those with children 2y8mo-4y5Mo at baseline who have expressed willingness to participate) within a radius of 3km from 149 pre-selected schools. The census will be used to determine the final 117 schools to participate in the study and their respective catchment areas (see above).
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After
Cohort 1: Randomization will take place by computer following a census of eligible households (those with children 2y8mo-4y5Mo at baseline who have expressed willingness to participate) within a radius of 3km from 149 pre-selected schools. The census will be used to determine the final 118 schools to participate in the study and their respective catchment areas (see above).
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Field
Randomization Unit
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Before
School and individual
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After
Cohort 1: School and individual.
Cohort 2: School
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Field
Planned Number of Clusters
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Before
117 Schools
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After
118 Schools
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Field
Planned Number of Observations
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Before
600 4 year-olds and 900 3-year -olds
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After
Cohort 1 recruited in January 2024: 600 4 year-olds and 900 3-year -olds
Cohort 2 Recruited in November 2024: 590 3-year-olds
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Field
Sample size (or number of clusters) by treatment arms
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Before
60 treatment schools each with: five randomly selected 4-year-olds (treated), 5 three-year-olds randomly selected to attend (treated) and 5 control three-year-olds living in the catchment area but not selected to attend in the randomization. The three year olds in the treated areas are individually randomized.
57 treatment schools each with: five four-year-olds (not treated) from the catchment area and five non-treated three-year-olds.
All children participating in the random selection belong to families who expressed the willingness for their children to attend pre-school.
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After
Cohort 1:
60 treatment schools each with: five randomly selected 4-year-olds (treated), 5 three-year-olds randomly selected to attend (treated) and 5 control three-year-olds living in the catchment area but not selected to attend in the randomization. The three year olds in the treated areas are individually randomized.
58 treatment schools each with: five four-year-olds (not treated) from the catchment area and five non-treated three-year-olds.
Cohort 2: Same 60 treatment schools and 58 control schools as in Cohort 1. We recruit 5 three year olds in the catchment area of each treatment and each control school. The children belonged to families that were the closest five who consented to participate in the intervention
All children participating in the random selection belong to families who expressed the willingness for their children to attend pre-school.
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