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GidMK's profile
Health Nerd
Health Nerd
Health Nerd
Verified account
@GidMK

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Health NerdVerified account

@GidMK

Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him

Sydney, New South Wales
theguardian.com/profile/gideon…
Joined November 2015

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    1. Health Nerd‏Verified account @GidMK 18 Nov 2020

      So, The Big Mask study has been published, and I thought rather than expound on what the results DID show (everyone's doing that), I might point out a few things that they DIDN'T show 1/npic.twitter.com/zG4jtXQVVq

      31 replies 257 retweets 683 likes
      Show this thread
    2. Mike Dee‏ @MikeDeeeeeee 18 Nov 2020
      Replying to @GidMK

      There does not seem to be a correction for sensitivity and specificity. The specificity of 99.2% (according to manufacturer) is low given the positive results of the sensitivity analysis (which are more robust than protocol analysis): 1.4% in mask group and 1.8% in control group.

      1 reply 2 retweets 25 likes
    3. Health Nerd‏Verified account @GidMK 18 Nov 2020
      Replying to @MikeDeeeeeee

      Omg I love this! Yes, I was thinking about adding that to the thread, using a Rogen-Gladen estimation, which gives you 1.59% and 1.95% in mask vs control, but thought it was too niche! Maybe I was overthinking it

      1 reply 0 retweets 24 likes
    4. This Tweet is unavailable.
      Health Nerd‏Verified account @GidMK 18 Nov 2020

      Yes, because it is about the test characteristics not immunity prior to the study. Excluding people who tested +ve at the start is because they were using serology not PCR testing or symptoms to define an infection

      3:08 PM - 18 Nov 2020
      • 4 Likes
      • Ringrás design PSBlaw James 'Vax Everywhere' Stevenson, PhD
      1 reply 0 retweets 4 likes
        1. This Tweet is unavailable.
        2. Asaf Peer‏ @asafpeer 18 Nov 2020

          You should also take the sensitivity of the first test into account. Also, number of cases was less than 30 per million at the time this gives a <0.1% chance to be infected over 30 days, how can it be 2% in the study? FP must be higher

          0 replies 0 retweets 0 likes
        3. End of conversation
        1. New conversation
        2. Mike Dee‏ @MikeDeeeeeee 18 Nov 2020
          Replying to @GidMK

          But note that they did not exclude people without baseline tests in their main analysis! Only their sensitivity analysis did this. And there are many.

          0 replies 0 retweets 2 likes
        3. This Tweet is unavailable.
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