Found this , looks handy
https://www.stevehoggbikefitting.com/bikefit/2011/02/seat-height-how-hard-can-it-be/
Basically ignore averages and work out whats best for you as your own personal flexibilty , proportions etc are all factors .
And this
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From Andy Pruitt (Boulder Center for Sports Medicine):
The theories concerning saddle height or knee flexion at dead bottom center have not changed as for formulated bike fitting. Formulas are a starting place for positioning. The LeMond formula is 88.6 percent of crotch-to-ground inseam measurement, while the Italian method says with a level pelvis, place your heel on the pedal and you should have a straight leg at dead bottom center, then as you move your foot to the cycling position you will have a slight bend while pedaling. I have professed for years a measured knee bend at dead bottom center of 30-35 degrees. Truth is, they all end up in approximately the same place.
So if these are all starting places, what are the factors that affect the final neutral saddle position? There are many to list. Active ankling, hamstring flexibility, quadriceps flexibility, cleat fore/aft position, patella thickness and depth of the patella groove and specific event (pursuit versus long road race). Crank-arm length effects saddle height, but not end result functional knee flexion at DBC."