Is being kind good for your health, or is having good health make you more kind?
From the article, “There is research suggesting that people who are in better health are more likely to volunteer, but because scientists are very well aware of that, in our studies we statistically control for that,” says Sara Konrath
Few as an example:
1. Individuals who do high risk activities might be less likely to do volunteer work.
2. Individuals who simply have bad habits in life might be less likely to volunteer.
3. People who die earlier won't even make it far enough to be in position to donate.
4. Poor people are less likely to be able to donate and can get less care for medicine, have worse conditions generally.
I see thousands of such examples, I don't think it's possible to control for all of that, is it? You would have to
1) List all of those things that should be controlled. I imagine already this to be an amazing feat.
2) Somehow gather all this data from people.