Another way we could rewrite the headline - 0.28% of ELECTIVE SURGERY PATIENTS IN NSW AND VICTORIA have had COVID-19 (given that this was the sample used) https://twitter.com/AndrewHayen/status/1305986788125630464 …
Yep. They used the Rogen-Gladen estimation technique to adjust the apparent prevalence for test specificity (98.91%) sensitivity (100%) 41/2991 = 0.0137 RG = (0.0137+(0.9891-1))/(0.9891+(1-1)) = 0.002838 = 0.28%pic.twitter.com/EQQfCGxQYO
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