It's true that ADHD adults have higher mortality from auto accidents, more health problems, higher divorce rates, greater unemployment, lower educational achiev

It's true that ADHD adults have higher mortality from auto accidents, more health problems, higher divorce rates, greater unemployment, lower educational achievement than non-ADHD peers. Despite all their disadvantages, rate of ADHD occurrence in the population has been stable as far as can be determined. The inference is reproduction is not impeded, and may exceed the population mean in light of anticipated losses as you describe. I haven't specifically looked into this, not recently anyway, but data may well be out there. Anecdotally it's a common pattern to see ADHD adults having had numerous partnerships which are not sustained beyond a few years. Not surprisingly, an ADHD parent can wind up with children from these several partners as a result, leading to the hypothesis that instances of high birthrate offset the fraction of ADHD adults with low birthrate. Obviously, even a small positive offset in birthrate of all ADHD vs. controls would be sufficient to keep incidence of ADHD constant.