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settlements. By comparison, Northern Africa<br />

has the <strong>low</strong>est prevalence of slums (13 percent<br />

in 2012). In Asia, the proportion of the urban<br />

population living in slums varies from 25 percent<br />

in Western Asia to 35 percent in Southern<br />

Asia. In Latin America and the Caribbean, slum<br />

prevalence is 24 percent. 22<br />

Most developing countries have a large share<br />

of their urban population living in slums, and<br />

the countries with larger percentages in slums<br />

tend to have higher urban child mortality rates.<br />

There are 11 countries where more than twothirds<br />

of all urban <strong>res</strong>idents are estimated to live<br />

in slums. These are: Central African Republic<br />

(96 percent), Chad (89 percent), Niger (82 percent),<br />

Mozambique (81 percent), Ethiopia (76<br />

percent), Madagascar (76 percent), Somalia (74<br />

percent), Benin (70 percent), Haiti (70 percent),<br />

Malawi (69 percent) and Liberia (68 percent).<br />

Seven of these 11 countries (all but Benin,<br />

Madagascar, Ethiopia and Niger) are also among<br />

the top 10 countries with the highest rates of<br />

urban under-5 mortality. 23<br />

Urbanization and Health<br />

Urbanization can have a positive or a negative<br />

impact on health. Infrastructure improvements<br />

such as better access to health services, education,<br />

sanitation and safe water supply that often<br />

accompany urbanization can improve health.<br />

But if urbanization is unplanned and rapid, it<br />

is prone to producing informal settlements<br />

with insufficient housing, poor sanitary conditions<br />

and crowding, all of which can accelerate<br />

the spread of diseases and lead to a worsening<br />

health status. The <strong>res</strong>earch suggests urban population<br />

growth in developing countries has done<br />

and may continue to do both. 24<br />

In general, nations that have high life<br />

expectancies and <strong>low</strong> mortality rates are highly<br />

urbanized. These are countries where city<br />

governments invest in sound policies. The<br />

improvements over the last 50+ years in mortality<br />

and morbidity rates in highly urbanized<br />

countries like Japan, Sweden, the Netherlands<br />

and Singapore are testimony to the potentially<br />

health-promoting featu<strong>res</strong> of modern cities. 25<br />

But rapid and disorganized urbanization can<br />

also lead to higher rates of under-5 mortality.<br />

This is especially true in <strong>low</strong>- and middleincome<br />

countries when rapid urbanization is<br />

combined with poor economic performance,<br />

poor governance, failure of national and urban<br />

housing policies, and institutional and legal failure.<br />

For example, recent <strong>res</strong>earch from Nigeria<br />

found that the urban child mortality rate<br />

increased with urban population growth. The<br />

increase in deaths was linked to more people<br />

living in slum-like conditions. 26<br />

14 Monrovia, Liberia

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