On: Association Between Sauna Bathing and All-Cause Mortality Events

Good, I live in a Sauna, 8 degrees north of the equator. That bodes well for my health :)

Joking aside, this study seems unlikely to have actually discovered a real effect, rather than just a group of people with lower risk and higher sauna usage in common. (Wealthy people?)

Given that the study was conducted in Finland, it's unlikely that wealth is a confounding factor in sauna usage.

The effect was only noticeable with sauna usage 4-7 times a week, more than wealth that implies free time, which implies lower stress (a risk factor) and, to a degree, wealth.