50% genetic ? I could not believe it. I thought it is much more environmental than genetic. So I checked the original research. There indeed was a caveat.

In the original research the loneliness was scored as mother’s ratings to what their 7, 10 and 12 years children complain.

http://www.statmodel.com/download/Bartels_loneliness_AJMG_2008.pdf

So use your discretion to interpret and extrapolate it to the loneliness of adult Sajhaites, folks !

Nepe