Yes, there are of course people below 175cm.

But your test is for people up to 170cm, not useless, but its a minority in the EU and US that represent the majority of forum users..

Note also that the younger people are taller than older people, if you suppress the older people, the average height is higher.

For female riders, not only the height is different, but the whole body sizing is different with longer legs and shorter torso. The experience of a male rider is not valid for female riders.