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  • Disparities in children’s vocabulary and height in relation to household wealth and parental schooling: A longitudinal study in four low- and middle-income countries

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  • Disparities in children’s vocabulary and height in relation to household wealth and parental schooling: A longitudinal study in four low- and middle-income countries

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Disparities in children’s vocabulary and height in relation to household wealth and parental schooling: A longitudinal study in four low- and middle-income countries

January, 2018
Liza BennyAndreas GeorgiadisSofya KrutikovaSantiago CuetoAbhijeet Singh
Chris Andersen, Sarah Reynolds, Jere Behrman, Aryeh Stein, Benjamin Crookston, Kirk Dearden, Lia Fernald
  • Early childhood development
  • Malnutrition and cognitive development
  • Education

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Children from low socio-economic status (SES) households often demonstrate worse growth and developmental outcomes than wealthier children, in part because poor children face a broader range of risk factors. It is difficult to characterise the trajectories of SES disparities in low- and middle-income countries because longitudinal data are infrequently available.

The authors analyse measures of children’s linear growth (height) at ages 1, 5, 8 and 12 and receptive language (Peabody Picture Vocabulary Test) at ages 5, 8 and 12 in Ethiopia, India, Peru and Vietnam in relation to household SES, measured by parental schooling or household assets. They calculate children’s percentile ranks within the distributions of height-for-age z-scores and of age- and language-standardized receptive vocabulary scores.

They find that children in the top quartile of household SES are taller and have better language performance than children in the bottom quartile; differences in vocabulary scores between children with high and low SES are larger than differences in the height measure. For height, disparities in SES are present by age 1 and persist as children age. For vocabulary, SES disparities also emerge early in life, but patterns are not consistent across age; for example, SES disparities are constant over time in India, widen between the ages of 5 and 12 in Ethiopia, and narrow in this age range in Vietnam and Peru. Household characteristics (such as mother’s height, age, and ethnicity), and community fixed effects explain most of the disparities in height and around half of the disparities in vocabulary. The authors also find evidence that SES disparities in height and language development may not be fixed over time, suggesting opportunities for policy and programs to address these gaps early in life.

Read the journal article in full, and further explore these findings, visit: https://www.sciencedirect.com/science/article/pii/S235282731730023X 

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