Published papers

This study examined the relationship between early parental treatment, specifically reading to young children and later cognitive development with a Bayesian perspective. Previous research established a positive link between parental reading to infants and their cognitive development, such as receptive vocabulary, reading comprehension and motivation to read. Using data from the Millennium Cohort Study, this study analysed individuals aged 9 months to 22 years to investigate the effects of early reading to young children on nine cognitive variables. Bayesian statistical analysis controlled for pre-existing differences and covariates to establish a causal association between reading and cognitive development. The results indicated that reading to infants and toddlers positively impacted their cognitive development beyond reading skills. These findings demonstrate the usefulness of the Bayesian approach in determining scientific significance and underscore the importance of early literacy interventions in promoting cognitive development.

The Child Allowance Policy (CAP) in Japan, a nationwide cash transfer program for families with children, was designed to increase household expenditures toward children. Using unforeseen changes in the CAP that occurred due to the electoral results as a source of exogenous variation in income in the early 2010s, this paper examines the causal impact of family income on households’ private educational expenditures and child outcomes in the short-run, based on a longitudinal parent-child survey. The ordinary least squares (OLS) and first-differenced (FD) results show that family income is in most cases positively correlated with child's cognitive outcomes, and, to a lesser extent, with families’ educational expenditure on their children. Based on the FD instrumental variable (FD-IV) estimation, using unexpected changes in CAP payments as an instrument, we find positive income effects on educational expenditure in the short-run. However, we did not find statistically significant impacts on children's cognitive outcomes.

This paper estimates the causal effect of education-oriented vs. care-oriented preschools on child development. We use a unique quasi-experiment from Japan that exploits plausibly exogenous regional and temporal variation in the relative availability of different preschools. We find that attendance at an education-oriented preschool is associated with significant improvements in mathematical and linguistic achievement that manifest later in adolescence. Positive effects can also be found for socioemotional measures. Ascending marginal treatment effect (MTE) curves suggest an inverse selection pattern: children that are least likely to enroll in the education-oriented preschool gain the most from it. This heterogeneity is mainly due to specific features of education-oriented preschools (i.e., educational orientation, the interaction with parents due to shorter operating hours, and peer effects), while gains from enrollment in care-oriented preschools appear more homogeneous.

Background: There are significant cross-country differences in socio-economic gradients in later childhood and adulthood overweight/obesity; few studies assess whether this cross-national variation is evident from early childhood. Furthermore, the role of childcare in explaining overweight/obesity gradients might vary across countries, given differences in access, quality and heterogeneity within. Additionally, childcare is linked to parental characteristics such as maternal employment. The interplay between childcare and employment in producing early overweight/obesity gradients has received little attention, and might vary cross-nationally. Methods: Using harmonized data from six high-quality, large datasets, we explore the variation in gradients in early overweight/obesity (at age 3-4 years old) by parental education across several high-income countries (USA, UK, France, the Netherlands, Germany and Japan). We then assess whether differential formal group care use attenuates some of these gradients, and whether this varies across maternal employment. Results: Gradients in early childhood overweight/obesity by parental education are evident across several developed countries. Countries with higher overall prevalence of early overweight/obesity did not have the largest inequalities across education groups. The contribution of formal group care to producing these gradients varied across countries and across maternal employment status. Conclusion: Early childhood inequalities in overweight/obesity are pervasive across developed countries, as noted for older children and adults. However, mechanisms producing these gradients vary across national contexts. Our study shows that, given the right context, quality childcare and maternal employment can successfully support healthy weight trajectories and not contribute (or even reduce) social inequalities in early overweight/obesity.