TeDaDeS
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I don't have a source for this one, so consider it a rumor, but I read somewhere that Covid hospitalization in the US also counted general hospitalization as Covid hospitalization if the patient got tested positive in the require entry-test of the hospital.Well, the title of the document kind of gives it away. The difficulty of selecting the root-cause of death. Take page 19 of the PDF (page 13). The root cause for the HIV patient or the root cause for the accident: Person had accident, person had ruptured aorta (main heart blood vessel), caused traumatic hypovolemic shock. One is and the other is not classified as covid death. I found that most interesting: how do they know the person not get unwell during travel which ultimately caused the accident. (a bit like pilots that get unwell - but fortunately, there's always a second pilot)
It also throws the illness codes, which is nice to see again. Which leads me to: https://www.icd10data.com/ICD10CM/Codes/S00-T88/T79-T79/T79-/T79.4 and revisions in code. Which leads me to wonder if my old translations in 2013 from ICD9 to ICD10 needs to be revised (but it's an old project for which I did not spend much time on to keep up-to-date year by year, and the dev did not reply back I hope @HelenF is still happy with it- probably learned the new codes by now and doesnt need to look up old codes)
So I can imagine sometimes it's not easy to determine the cause for hospitalization or death and possibly this can cause a bias, which can influence statistics.
I also read somewhere that the Netherlands is going to randomly probe Covid tests to see if they detect the flu, I imagine they want to know how many people have flu instead of Covid.