Publication: Enhancing Young Children’s Language Acquisition through Parent–Child Book-Sharing: A Randomized Trial in Rural Kenya
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Published
2020-01
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0885-2006
Date
2020-01-02
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Worldwide, 250 million children under five (43%) are not meeting their developmental potential because they lack adequate nutrition and cognitive stimulation in early childhood. Several parent support programs have shown significant benefits for children’s development, but the programs are often expensive and resource intensive. The objective of this study was to test several variants of a potentially scalable, cost-effective intervention to increase cognitive stimulation by parents and improve emergent literacy skills in children. The intervention was a modified dialogic reading training program that used culturally and linguistically appropriate books adapted for a low-literacy population. We used a cluster randomized controlled trial with four intervention arms and one control arm in a sample of caregivers (n?=?357) and their 24- to 83-month-old children (n?=?510) in rural Kenya. The first treatment group received storybooks, while the other treatment arms received storybooks paired with varying quantities of modified dialogic reading training for parents. Main effects of each arm of the trial were examined, and tests of heterogeneity were conducted to examine differential effects among children of illiterate vs. literate caregivers. Parent training paired with the provision of culturally appropriate children’s books increased reading frequency and improved the quality of caregiver-child reading interactions among preschool-aged children. Treatments involving training improved storybook-specific expressive vocabulary. The children of illiterate caregivers benefited at least as much as the children of literate caregivers. For some outcomes, effects were comparable; for other outcomes, there were differentially larger effects for children of illiterate caregivers.
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Publication Enhancing Young Children's Language Acquisition through Parent-Child Book-Sharing(World Bank, Washington, DC, 2019-02)Worldwide, 250 million children under five (43 percent) are not meeting their developmental potential because they lack adequate nutrition and cognitive stimulation in early childhood. Several parent support programs have shown significant benefits for children's development, but the programs are often expensive and resource intensive. The objective of this study was to test several variants of a potentially scalable, cost-effective intervention to increase cognitive stimulation by parents and improve emergent literacy skills in children. The intervention was a modified dialogic reading training program that used culturally and linguistically appropriate books adapted for a low-literacy population. The study used a cluster randomized controlled trial with four intervention arms and one control arm in a sample of caregivers (n = 357) and their 24- to 83- month-old children ages 24 to 83 months (n = 510) in rural Kenya. The first treatment group received storybooks, while the other treatment arms received storybooks paired with varying quantities of modified dialogic reading training for parents. The main effects of each arm of the trial were examined, and tests of heterogeneity were conducted to examine differential effects among children of illiterate versus literate caregivers. Parent training paired with the provision of culturally appropriate children’s books increased reading frequency and improved the quality of caregiver-child reading interactions among preschool-age children. Treatments involving training improved storybook-specific expressive vocabulary. The children of illiterate caregivers benefited at least as much as the children of literate caregivers. For some outcomes, the effects were comparable; for other outcomes, there were differentially larger effects for children of illiterate caregivers.Publication Multilingual Assessment of Early Child Development(World Bank, Washington, DC, 2019-09)In many low- and middle-income countries, young children learn a mother tongue or indigenous language at home before entering the formal education system where they will need to understand and speak a country's official language(s). Thus, assessments of children before school age, conducted in a nation's official language, may not fully reflect a child's development, underscoring the importance of test translation and adaptation. To examine differences in vocabulary development by language of assessment, this study adapted and validated instruments to measure developmental outcomes, including expressive and receptive vocabulary. This study assessed 505 children ages 2 to 6 in rural communities in Western Kenya with comparable vocabulary tests in three languages: Luo (the local language or mother tongue), Swahili, and English (official languages) at two time points, five to six weeks apart, between September 2015 and October 2016. Younger children responded to the expressive vocabulary measure exclusively in Luo much more frequently than did older children: 44–59 percent of those ages 2 to 4, compared to 20–21 percent of those ages 5 to 6. Baseline receptive vocabulary scores in Luo and Swahili were strongly associated with receptive vocabulary in English at follow-up, even after controlling for English vocabulary at baseline: a multivariate regression of follow-up English vocabulary on standardized measures of receptive vocabulary in all three languages yields an estimate, for Luo, of β = 0.26, SE = 0.05, p < 0.001; and for Swahili, β = 0.10, SE = 0.05, p = 0.032. The study also found that parental Luo literacy at baseline was associated with child English vocabulary at follow-up, while parental English literacy at baseline was not: a multivariate regression on both measures, along with household controls, yielded, for Luo, β = 0.11, SE = 0.05, p = 0.045; the coefficient on English was not statistically significantly distinguishable from zero (p=0.18). The findings suggest that multilingual testing is essential to understanding the developmental environment and cognitive growth of multilingual children.Publication Big Sisters(World Bank, Washington, DC, 2020-10)This paper models household investments in young children when parents and older siblings share caregiving responsibilities and when investments by older siblings contribute to young children's human capital accumulation. To test the predictions of the model, the paper estimates the impact of having one older sister (as opposed to one older brother) on early childhood development in a sample of rural Kenyan households with otherwise similar family structures. Older sibling gender is not related to household structure, subsequent birth spacing, or other observable characteristics, so the presence of an older girl (as opposed to an older boy) is treated as plausibly exogenous. Having an older sister rather than an older brother improves younger siblings' vocabulary and fine motor skills by more than 0.1 standard deviations. Viewed through the lens of the model, the empirical pattern shown here suggests that: (i) older siblings' investments in young children contribute to their human capital accumulation, and (ii) households perceive lower returns to investing in older girls than in older boys.Publication Examining Early Child Development in Low-Income Countries(World Bank, Washington, DC, 2009-04-03)The primary purpose of this toolkit is to provide a resource for researchers from various disciplines interested in planning and evaluating programs or interventions aimed at improving the health and development of infants and young children. The toolkit aims to: provide an overview of issues affecting early development and its measurement; discuss the types of tests typically used with children under five years; provide guidelines for selecting and adapting tests for use in developing countries, and make recommendations for planning successful assessment strategies. The toolkit focuses on children who have not yet entered school, and are thus under six years old. The primary reason we are focusing on this age group is that during the first five years of life, children's language, early understanding of mathematics and reading, and self-control emerge. The extent to which children master these skills during this critical period has implications for success in school (Lerner, 1998), and thus we wanted to focus on children in this pre-school period. The toolkit is essential at this time for the following reasons: children in developing countries are growing up at a disadvantage; assessments of children must expand to include a wider range of outcomes; and no such toolkit exists as present.Publication Investing in Young Children : An Early Childhood Development Guide for Policy Dialogue and Project Preparation(World Bank, 2011)Investing in young children is the responsible thing to do. All children deserve a chance to grow into healthy, educated, and competent people, no matter where and when they were born. While parents bear most of the responsibility for raising their children, especially in the early years of life, governments also have an important role during this critical time of human capital accumulation. For example, governments can ensure that all expectant mothers and young children have access to quality health services and nutrition. They can support parents and other caregivers in providing a positive and stimulating environment for children from birth on by promoting parenting information programs, investing in direct services such as home-based visits, funding daycare centers and preschools, or providing financial incentives to access good quality programs for infants and children. This Early Childhood Development (ECD) guide presents lessons and experiences that have been useful in informing the policy debate about ECD interventions and the design of such programs across the world. Whether the user of this guide is at the initial stage of deciding whether to expand an ECD portfolio or already in the program design stage, the content offers a range of evidence- based options to inform policy and investment choices.
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