Geneva looks practically the same - 0.64% https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30584-3/fulltext … Others are 60-100% higher. i.e. Sweden Doing a secondary sensitivity analysis for AB vs. adjusting for it as a primary median are very different. You did it for fatalities, but not AB, which creates large bias.
For this not to be the case, you have to assume that there is a fixed cutoff beyond which antibodies decay, which is missed by all sensitivity calculations. Since this is false, it's likely that most of your point is captured in test sensitivity already
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They decay at different rates over different time periods. By 4 months it's higher than it was at 3 months. By 3 months, it's higher than at 1 month. So using the same sens & spec regardless of time along the decay curve misses a meaningful # of infections.
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