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Socioeconomic Inequalities in Child Malnutrition in the Developing World


Adam Wagstaff


World Bank - Development Research Group (DECRG)

Naoke Watanabe


World Bank

November 1999

World Bank Policy Research Working Paper No. 2434

Abstract:     
Despite the development community's shift in emphasis toward the poor, malnutrition, like other dimensions of poor health, is concentrated among the worst off. Yet targets are still defined in terms of population averages. Consider, then, this information about malnutrition rates among different economic groups in 20 developing countries.

Among the conclusions Wagstaff and Watanabe reach about malnutrition rates among different economic groups:
· Inequalities in malnutrition almost always disfavor the poor.
· It's not just that the poor have higher rates of malnutrition. The rate of malnutrition declines continuously with rising living standards.
· The tendency of poorer children to have higher rates of stunting and underweight is not due to chance or sampling variability. Inequalities in stunting and underweight, as measured by the concentration index, are statistically significant in almost all countries.
· Inequalities in underweight tend to be larger than inequalities in stunting, which tend to be larger than inequalities in wasting.
· In most cases, whatever the malnutrition indicator, differences in inequality between countries are not statistically significant.
· Even if attention is restricted to the cross-country differences in inequality that are statistically significant, interesting conclusions emerge. Egypt and Vietnam have the most equal distributions of malnutrition, and Nicaragua, Peru, and, to a lesser extent, Morocco have highly unequal distributions.
· Some countries (such as Egypt and Romania) do well in terms of both the average (the prevalence of malnutrition) and the distribution (equality). Others do badly on both counts. Peru, for example, has a higher average level of stunting than Egypt and higher poor-nonpoor inequality. But many countries do well on one count and badly on the other. Brazil, for example, has a far lower (less than 20 percent) stunting rate overall than Bangladesh (more than 50 percent) but has four times as much inequality (as measured by the concentration index).
· Use of an achievement index that captures both the average level and the inequality of malnutrition leads to some interesting rank reversals in the country league table. With stunting, for example, focusing on the achievement index moves Egypt (a low-inequality country) from sixth position to fourth, higher than Brazil and Russia (two countries with high inequality).

This paper - a product of Poverty and Human Resources, Development Research Group, and the Health, Nutrition, and Population Team, Human Development Network - is part of a larger effort in the Bank to investigate the links between health and poverty. The study was funded by the Bank's Research Support Budget under the research project Inequalities of Child Health: Comparing the LSMS and DHS (RPO 683-47). The authors may be contacted at awagstaff@worldbank.org or nwatanabe@worldbank.org.

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Date posted: December 10, 2004  

Suggested Citation

Wagstaff, Adam and Watanabe, Naoke, Socioeconomic Inequalities in Child Malnutrition in the Developing World (November 1999). World Bank Policy Research Working Paper No. 2434. Available at SSRN: http://ssrn.com/abstract=632505

Contact Information

Adam Wagstaff (Contact Author)
World Bank - Development Research Group (DECRG) ( email )
1818 H. Street, N.W.
MSN3-311
Washington, DC 20433
United States
HOME PAGE: http://econ.worldbank.org/staff/awagstaff
Naoke Watanabe
World Bank ( email )
1818 H Street, N.W.
Washington, DC 20433
United States
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