It will be interesting to see if that paper passes peer review (if in fact it has been submitted for peer review which isn't obvious).
They seem to be attributing the difference to vaccination rates. But that of course is an assumption. There were probably any number of differences between those two groups. Off the top of my head:
1.) Republicans skew more blue collar in terms of employment. A high percentage of white collar jobs moved to work from home and were therefore more isolated. But, your plumber or mechanic can't exactly do his work from home so he had to stay out in the world and therefore more exposed. Of course, the work at home crowd depended heavily on the services of those that could not work from home, so it would be a bit ironic if they sneered at the other side for their higher death rates if this were a significant explanation of the differences.
2.) Democrats seemed to be more inclined to "shelter in place" and not venture out in public. My observation is that a higher percentage of my Democrat friends eschewed going to restaurants, church services, public gatherings, etc. That will of course lower rates of infection.
3.) Democrats seemed more inclined to wear masks. I don't think that played a role personally, but it must be stated if we're being honest.
4.) And of course, there were differences in vaccination rates.
If they really wanted to get closer to the truth, they would have examined both excess death rates and infection rates. That might have been somewhat more revealing. As the paper stands now, they've potentially made a correlation between excess deaths and political party affiliation, but they've not explained it and they've certainly not pinned it on vaccination rates.
Another point of contention - their observation that excess death rates tracked prior to covid but diverged after the pandemic isn't that material to addressing the differences in age demographics. Before the pandemic, "excess deaths" is mainly just random noise since nothing is really driving it. When an 80 year old dies of natural causes, that's not an excess death.
But, if Republican's skew older and therefore more susceptible to death by covid infection, then of course they will register more excess death after the start of the pandemic. In fact, that is the outcome you would expect. Had they provided graphs for excess deaths per political party broken down by age demographic, that would have been much more informative. Maybe they addressed that in the text, but I saw no such graph. We can't compare these groups in aggregate if the age distributions aren't very similar when we talk about a pandemic that vastly targets the elderly when it comes to fatalities.
The fact that they did not address these obvious differences in these two groups makes me question to what extent they were really trying to get at the truth.
That paper btw bears all the hallmarks of being some class project rather than some serious in depth investigation. I'd bet I'm looking at something that is the result of a master's level course in statistics or public health.
ETA: What I'm asking for is their second graph for each of their age bins. They did some sort of regression analysis of the difference between excess death rates (third graph "percentage point difference in excess deaths between Republicans and Democrats after regression adjusting for year-month-by-age-bin-by-county differences") but they don't provide good detail on how they did the regression. Simply plotting the graphs for each age bin would have been unambiguous. In any case, that third graph implies a 15% (ish) difference, not a "153% difference". The "153% difference" seems like click bait cooked up by someone's marketing department.
Edited by Daniel Cooper, 31 August 2023 - 03:36 PM.