"Living alone was not associated with dying prematurely for those in the highest socioeconomic group — the 19 percent of study participants who had a university degree or worked in an executive position. But for the rest, the lower the socioeconomic status, the higher the risk for death. The authors emphasize that the remaining 81 percent of the population was not deprived or living in poverty, but consisted mainly of middle-class and skilled and unskilled workers."
Socioeconomic class moderates mortality even among the loners? That's not unexpected.
That said, I wonder if Danish society contributes particularly to loneliness. Most happiness studies (a trend in recent years) place Denmark at the top of happiness indices, but my understanding is happiness in this context often doesn't reflect an emotional well-being among individuals, only a quantitative aggregate one. Much has been said about the Danish concept of hygge (cozyness) but Scandinavian life in general is very privatized. I wonder if Danish social connectedness metrics are perhaps not so stellar.