> And people in the Left Coast’s poorest quartile of counties live 2.4 years longer than those in the richest quartile counties in the Deep South.
That's super indirect it doesn't mean that there is a regional effect. Maybe a rich quartile county in the deep south has one multibillionaire who has good healthcare and a hundred thousand poor people who have bad healthcare because they are poor. Or maybe the poorest quartile counties in that 'left coast' region are still richer than the richest quartile counties in the 'deep south' region, probably not but they don't say.