Well hello and happy new year! I hope everyone has had a delightful holiday season and is doing well. As promised, I am back with a state level excess mortality update. Now, I didn’t get to this for a few weeks due to some aforementioned personal life things, and while I was gone I discovered the CDC had update the way they calculated excess mortality and was releasing slightly different numbers from the ones I was previously looking at. You can read their full explanation here, but here’s the gist:
Excess mortality is calculated by taking the prior 4 years worth of deaths and averaging them together to get a baseline of how many people you’d expect to die in a state in any given week. When the pandemic started, the CDC stopped including new deaths in their baseline, because of course we’re all hoping this current mortality level doesn’t become the baseline. Now that the pandemic has gone on for nearly 2 years however, this meant that they were only using 2 years worth of data to determine the “expected” number of deaths. So they decided to go back 6 years (while still excluding our 2 pandemic years, so basically 4 years of data) to get a better baseline. This changed everyone’s excess counts a bit because the baseline was now a bit different. They note that on average this slightly lowered excess mortality estimates by about 2%. In this post I’m going to take a look at if the new calculations substantially changed anything we were seeing before.
To note: they are now only releasing “deaths above average” so that’s what I’m posting here, rather than both deaths above 2SD and above average like I was before. Additionally, this death count is probably going to go up quite a bit in the next 4 weeks as it includes deaths that were reported during Christmas week, which tend to be artificially low.
Excess Mortality Above Average
Alright, first, here’s the map. When I last posted this 6 weeks ago, the range was about 953-4784 excess deaths/million residents. Now it’s 872-4962. So some states clearly lost and some gained:
Here are the top 10, along with their change from the mid-November data:
|State||Excess Deaths Above Average/Million, 2/1/20-12/27/21||Change from 11/10/21||Change in Rank|
I looked at Wyoming and West Virginia in particular to see if the change in rank was due to the recalculation or reported deaths, and both states have been running at 50-75% excess mortality since September. With reporting delays, those are likely real increases.
I also looked at the top 10 states that increased their excess mortality count. The ones that showed big increases but didn’t make the top 10 overall were: Alaska (+864, 35th place), Vermont (+362, 25th place), Maine (+331, 45th place), Wisconsin (+314, 41st place), Michigan (+274, 17th place), and Minnesota (+231, 48th place).
I was quite thrilled to see Massachusetts is now 49th in the nation, though the CDC list includes Puerto Rico and DC, so that’s out of 52. New Hampshire is 51st.
Percent Excess Mortality, 2020 vs 2021
A new metric included in the data is the percent excess for each state by week. I thought this was interesting, because some states had a very different 2020 vs 2021. The average percent excess mortality for all states in from 2/1/20 to 12/31/2020 was 16.4%, the average so far for 2021 is 15.6%. Here are the top states in 2020, and how they fared in 2021:
|State/Territory||% Excess 2/1/2020 to 12/31/2020||% Excess 2021 (reported so far)||Difference|
|New York City||53.6||14.6||-38.9|
Now here’s the reverse: top % excess in 2021, vs how they did in 2020.
|State/Territory||Average % Excess 2/1/2020 to 12/31/2020||Average % Excess 2021 (reported so far)||Difference|
Unsurprisingly, having 2 bad years appears to land you on the overall top 10 list pretty quickly. I’ll be updating this again to see what 2021 comes in at when we have more reported. With the holidays and the pre-existing reporting delays, this should be relatively straightforward to get.
As always, let me know if there are any questions! Stay safe out there.