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International Journal of Epidemiology 2001;30:1241-1243
© International Epidemiological Association 2001

Reformulations

Commentary: Birthweights and Bell Curves

Richard David

Cook County Hospital, University of Illinois at Chicago, Chicago, IL, USA.

The relationship between an infant's birthweight and survival chances has been recognized for over a 100 years,1 but in this issue of the International Journal of Epidemiology Allen Wilcox has pulled together work from recent decades that brings a clearer understanding of what we know and do not know.2 His refined analysis of birthweight distributions and how they conform, or fail to conform, to the familiar bell-shaped normal distribution has made possible more informative comparisons between different populations than earlier approaches. Incorrect underlying assumptions or inadequate data weakened much prior work in this field. The point of research in birthweight is to reduce perinatal deaths, and a focus of population comparisons has been to eliminate the gross disparities in outcomes between ethnic groups. The Wilcox model of population birthweight analysis has been faulted by critics as, in effect, perpetuating . . . [Full Text of this Article]

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