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Replying to @GidMK
First off; the reason I'm despairing. Media coverage on a big observational study of stroke/dementia and diet drink consumptionpic.twitter.com/j8IeRzBBVd
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Replying to @GidMK
Health Nerd Retweeted Health Nerd
So, everyone I know is now freaking out that if they drink diet drinks they'll have a stroke or get dementiahttps://twitter.com/GidMK/status/857091846438367232 …
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Replying to @GidMK
Health Nerd Retweeted Health Nerd
And that's because every article you read on the subject gets it wrong. Very unsurprising.https://twitter.com/GidMK/status/857091846438367232 …
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Replying to @GidMK
This isn't new. From the Pill to ibuprofen, every time a large observational study comes out, the media goes wild https://medium.com/@gidmk/why-is-the-pill-so-depressing-1b429d271d33 …
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Replying to @GidMK
And yet not a single media outlet identifies these as observational. Ever. They act as if these are perfect proof of causation.
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Replying to @GidMK
Health Nerd Retweeted Health Nerd
This is the first huge problem; YOU CAN'T PROVE CAUSATION WITH AN OBSERVATIONAL STUDYhttps://twitter.com/GidMK/status/857091846438367232 …
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Replying to @GidMK
You can get a huge amount of information, and with successive studies you can get a very good idea of causation, but one study?
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Replying to @GidMK
After this we have the tired old canards of shoddy reporting; poor understanding of risk ratios, over-reliance on p-values etc
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Replying to @GidMK
Health Nerd Retweeted Health Nerd
In this particular study's case, there WAS no effect of diet drinks on dementia. All the articles were wronghttps://twitter.com/GidMK/status/857092472379506688 …
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Health Nerd Retweeted Health Nerd
When the authors controlled for other risks (such as diabetes), the significance disappearedhttps://twitter.com/GidMK/status/857092472379506688 …
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Replying to @GidMK
That leaves us with stroke, for which the authors did find a significant association with diet drinks
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Replying to @GidMK
And whilst this is interesting, there was sufficient information in their study to infer that it wasn't actually due to the diet drinks
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