And also: Poor folks don't survive long enough to become seniors who vote.
https://nymag.com/intelligencer/2018/05/poor-people-often-do...
Tragic.
ADI was a little harder, landed on https://www.ahajournals.org/doi/10.1161/JAHA.120.020466 after a few searches.
The current iteration: https://www.neighborhoodatlas.medicine.wisc.edu/
Not sure if this is what OP meant, but I read ADI as acceptable daily intake. Area deprivation index might also fit.
ADI: Area Deprivation index