Average height of men by year of birth
How Tall is the Average American Man
Men in the U.S. are getting shorter, and heavier, study shows
Standing Tall: Plains Indians Enjoyed Height, Health Advantage
Average Height of American Men
What is the mu of the x bars? During the First World War there were many young men not fit enough to join up.
Nations that consume more protein in the form of , , , and tend to be taller, while those that obtain more protein from tend to be shorter.
Since 2012 data are not yet available, I assumed that it is the same as it was in recent years.
A tall father may end up having a shorter son or a shorter father may end up having a taller son.