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Recent data on heights uses additional sources including surveys and medical records.
The most common indicators of development are income, education and health.This problem has been highlighted by academics researching human height.In fact, the observed drop in height during the industrial revolution -- usually attributed to the negative health impacts of industrialisation -- can be explained by the labour market conditions that existed at the time.When we exclude the richest countries from our sample we find that the positive correlation between income and height becomes negative.
This result is due to Africans being significantly taller than their Asian and Latin American counterparts.
Historical data on heights tends to come from soldiers (conscripts), convicted criminals, slaves and servants.