The problem is that initially, we stopped the clock BEFORE PEOPLE HAD THE OUTCOME WE ARE INTERESTED IN This meant that the difference - even though it was there! - was impossible to see in our data
Gotta say I disagree. One Iranian study calculated IFR from the deaths on the day their seroprevalence data was collected - if they had used deaths from a week later, the IFR estimate would've doubled
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Ok I was assuming some lag between collecting data and mortality figures used (same day seems very efficient!). The importance will still be greater in a study using diagnostic test, as most pos seroprevalence will be over their infection. Cohort study best if possible
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Efficient is definitely one way to describe it!
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