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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 14 Jun 2020

      Over the weekend, everyone's been talking about this new study on masks and COVID-19 that apparently shows that masks prevent the disease and that pretty much all transmission is airborne As has been pointed out, the study is terrible and proves nothing 1/npic.twitter.com/Zx6ndmtSkn

      2 replies 40 retweets 79 likes
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    2. Health Nerd‏Verified account @GidMK 14 Jun 2020

      Health Nerd Retweeted

      2/n a couple of very nice threads looking at the issue: https://twitter.com/NoahHaber/status/1271518754627678208?s=20 … https://twitter.com/KateGrabowski/status/1271542361244352514?s=20 …

      Health Nerd added,

      This Tweet is unavailable.
      1 reply 2 retweets 3 likes
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    3. Health Nerd‏Verified account @GidMK 14 Jun 2020

      3/n On top of these, I wanted to note a couple of other things that make this study obviously wrong in terms of design and conclusions

      1 reply 1 retweet 2 likes
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    4. Health Nerd‏Verified account @GidMK 14 Jun 2020

      4/n The study is here https://www.pnas.org/content/early/2020/06/10/2009637117 … Basically, the authors compared the rate of infections before/after mask interventions in three places to a linear trend extrapolation, and found that after masks there were fewer infections than before

      1 reply 1 retweet 1 like
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    5. Health Nerd‏Verified account @GidMK 14 Jun 2020

      5/n They also plotted linear regressions of pre-mask and post-mask interventions, showing a linear trend upwards and then downwards Thus, masks caused the change!pic.twitter.com/FsshjCPfTH

      1 reply 1 retweet 3 likes
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      Health Nerd‏Verified account @GidMK 14 Jun 2020

      6/n Now, this is at face value implausible. The authors have picked out masks as an intervention, but the reality here is that there was NO SINGLE INTERVENTION that you could easily point to at any moment in time

      4:15 PM - 14 Jun 2020
      • 2 Retweets
      • 9 Likes
      • Dr Naomi Harvey (PhD not MD) #GetVaccinated Melissa Lewis L Liz *Double Shot* Darvill 💉💉 Emily Hulse Harry Hong   Dan Killam, PhD Bryan M
      1 reply 2 retweets 9 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 14 Jun 2020

          7/n In New York, in the same week that the governor signed a mask law, there were at least 2 other laws implemented regarding COVID-19, and many changes in policy as well It's not as simple as a single intervention!

          1 reply 1 retweet 2 likes
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        3. Health Nerd‏Verified account @GidMK 14 Jun 2020

          8/n Moreover, the authors have cherry-picked 3 specific places that appear to support their argument This is obviously bad science - what about the rest of the world?

          1 reply 1 retweet 3 likes
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        4. Health Nerd‏Verified account @GidMK 14 Jun 2020

          9/n What about Australia, where we've never had mask laws (and most people don't wear masks)?pic.twitter.com/CfulD3MWkq

          3 replies 1 retweet 4 likes
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        5. Health Nerd‏Verified account @GidMK 14 Jun 2020

          10/n Or South Korea, where masks have always been a major part of the pandemic response? Both of these are direct counter-examples to the arguments made in the piece, but are excludedpic.twitter.com/ESNAGvHb4C

          3 replies 1 retweet 2 likes
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        6. Health Nerd‏Verified account @GidMK 14 Jun 2020

          11/n There are dozens more such examples. While in some countries masking was temporally related to declines in case numbers, this is by no means true of every place in the world

          1 reply 1 retweet 1 like
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        7. Health Nerd‏Verified account @GidMK 14 Jun 2020

          12/n So the authors have cherry-picked their interventions, cherry-picked their locations, and as others have identified done quite a few other questionable things as well It is ~very~ frustrating to see

          1 reply 2 retweets 4 likes
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        8. Health Nerd‏Verified account @GidMK 14 Jun 2020

          13/n Especially since I am not against masks! The point here is not that masks do or do not work, it is that this paper provides absolutely no evidence either way and is largely useless at determining cause and effect

          3 replies 4 retweets 25 likes
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        9. End of conversation

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