where did you get the "anything under 50 = very long legs"? can't find it. Or is that data from some other reference?
I made it up , observing/analyzing the global data chart in that pdf , the 18yo and 20+yo collumns.
It seems average is between 51 and 54.
Also it says in the same paragraph "Mean
SHR for populations of adults varies from minimum values, i.e., relatively longest legs, for Australian
Aborigines (SHR = 47.3 for men and 48.1 for women) to the maximum SHR values, i.e., relatively
shortest legs, for Guatemala Maya men and Peruvian women ( SHR = 54.6 and 55.8 )."
So there you go , values vary from 47 to 55 , average ~52,5 , so 50 is between average and longest legs existing.
Also , my analytical data :
Sitting height = 36,4''
Standing height = 72''
Squatting deep: its all ok until ~210lbs ( ~75% 1RM ) , above that i have serious trouble getting out of the hole, im allready uncomfortable at parallel...