A LTHOUGH evidence to support such a thesis is scanty, it is generally believed that rural migrants to urban areas are better physical risks than urban natives. In the popular conception a ruralurban migrant is a healthy young person who helps to renew the vigor of a jaded and physically inferior urban population. Although based on inconclusive data, the few scientific studies of this problem have tended to substantiate the popular conception.' The available evidence does lead to the inference that rural-urban migrants are healthier than the resident urban population. For example, Hutchinson's study2 indicates that for Stockholm there is a greater risk of dying from tuberculosis for Stockholm-born than for those born elsewhere, principally rural born. Similar findings were reported in Hill's wellknown study3 for London. However, the hypothesis that migrants are the healthier persons is not substantiated in a comparison of rural-urban migrants and urban natives based on previously unpublished data of the National Health Survey.4 The National Health Survey5 covered a
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