Most of the commenters and the study itself focus on the differences in deaths among the different levels. But what struck me is the deviation in the relationships: simply put, the rate goes down between 1995 and 2010 for all groups, all except those who didn't graduate high school. I didn't see any explanation offered for why that group might have an increase in fatality rate. I could guess maybe a change in drug usage--meth and oxy usage is, I believe, up particularly in rural areas, but that seems unlikely to move the trend that much.
Chalk it down to a mystery.
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