This study covered mental health issues of entrepreneurs (results summary starts on page 13): http://www.michaelafreemanmd.com/Research_files/Are%20Entrep...

From the study, if you're an entrepreneur, you are more likely to have a mental health issue (49%) than not (48%). Significantly higher rates of suicide, depression, etc.

It's higher across the board.

But it isn't just from the stress of starting a company.. entrepreneurs are more likely to have close relatives with mental health issues too.

I wasn't able to find much other than that... so if anyone else has more links, I would be interested in reading them.

Good info, thanks. Makes a lot of sense that ADHD would be prevalent.