> Setting: Use of death certificates from the National Vital Statistics System in the United States, which were linked to occupation, 1 January 2020-31 December 2022.

Doesn't this mean that if you get Alzheimer's and as such are unable to work, that it is quite unlikely you would show up as a taxi/ambulance driver in this study?

Such studies need to account for transfers between groups, but rarely seem to do so (I did not read the complete paper, please correct me as necessary).