Epidemiology?: Your question made me think of two things - first the definition of the study of changes/diseases in a population - Epidemiology. http://www.who.int/childgrowth/publications/WHO_growth_charts.pdf But if you want an interesting read about the history of the development of the growth charts: http://www.who.int/childgrowth/publications/WHO_growth_charts.pdf
Answered 9/7/2015
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