[bhelkey]

> The apparent reduction in life expectancy for adults with diagnosed ADHD relative to the general population was 6.78 years (95% CI: 4.50 to 9.11) for males, and 8.64 years (95% CI: 6.55 to 10.91) for females.

It's not clear to me that there is a difference. It looks like the confidence intervals overlap.

[wizzwizz4]

You'd need to do a different analysis to decide whether there's a <5% chance of this data being generated by two identical distributions – but if we're not doing that, then we can't conclude that they're different.