about the first fact: if the fingers are the same length you have an equal risk to all those things mentioned. if you measure with a ruler you may find they are not exactly the same.
To read more on this search 2d:4d ratio
disturbing facts playlist:
https://www.youtube.com/playlist?list=PL8q1YnpdzCozTRSeeU63c-ki-ZBfPM-EN