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Though in general, human height has increased around the world, the following tables demonstrate that this trend is not universal.
Shapiro concluded that environmental factors, particularly diet and healthcare, play a significant role in determining height and other physical characteristics.
Human height is determined by a combination of genetics and environmental factors making it an active area of research in both the sciences and social sciences.
Recent breakthroughs in sequencing the human genome have allowed identification of 697 genetic variants that influence the height of an individual.
Although genetics plays an important role in understanding variation within a given population, human growth can be limited by poor childhood nutrition and illness.
This makes height strongly correlated with living standards and hence a good proxy for them.
Another factor to consider is the potential sample bias from the historical sources.