That´s one of my favorite topics when it comes to anatomy.
The torso ratio / measurement is exactly the same for a midget like it is for Andrew the giant.
Only that the midget has shorter legs and arms in comparison. The dimensions/ratio of the
ribcage is identical.
I find that way more helpful than measuring the body in 7,5 or 8 head units. The torso is
(for me) the most important part in figure drawing and it´s very convenient that this part
has the same dimensions for every human.
Here are some examples of what I mean. I always used exactly the same torso and placed
it over different figures. The only consisent part is the ribcage. The arms / leg ratio have nothing
to do with the ratio of the ribcage, there is no connection.
It´s the same for humans which are 6 or 8 heads tall. Short or long legs
The last picture is a scaled up version of the midget, ribcage identical, but different arm and leg length
and you can´t apply the crotch method to it



