So this is interesting, but I think the claim is overstated, or at least, this doesn't satisfy the claim that cities are less healthy. This show a positive correlation of an increase in specific mental health cases, but that is looking at health only along a single axis.

I'm not saying your claim is wrong, just that this isn't sufficient. There is other evidence that shows that city living is healthier with longer lifespans and reduced obesity.

It's a fascinating subject and one I love to "argue" about when I'm traveling for work and at a bar in the city, people get really fired up! We all dig in to support our life choices.

People in the city tend to be younger and higher income - both skew the numbers. Access to health services - advantage city vs rural. But the stress level is off the charts higher in a city. This is terrible for you.

There is some evidence that suburban or exurban might be the sweet spot, where you get the benefit of access to care and less daily stress.

Walking and movement is important too, so if you can combine income with small town living (community) in an active way you may be way ahead of the game.

I went to school in the Midwest and a good example of this is if you had a hybrid/remote job in Louisville or Cincy, it would likely be much better for your health to live in Madison, Indiana. It's not far away but feels like a different world, much more low key and with a community focus. You could always drive into the city and book a few days if you had that desire.