Authors Marta Rubio-Codina, Orazio P Attanasio, Costas Meghir, Natalia Varela and Sally Grantham-McGregor, studied the socio-economic gradient of child development on a representative sample of low- and middle-income children aged 6-42 months in Bogota and found statistically significant difference between children in the 90th and 10th percentile of the wealth distribution in their sample of 0.33 standard deviations (SD) in cognition, 0.29 SD in receptive language and 0.38 SD in expressive language at 14 months. However the gap was significantly reduced by variables related to the home environment i.e. parental investments in care quantity and quality. These findings have important implications for the design of well-targeted, effective and timely interventions that promote early childhood development.
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