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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 8 Sep 2019

      After correcting for a modest number of confounders, they found that kids whose mothers were stressed when they were pregnant were more likely to have mental health problems when they grew uppic.twitter.com/jLgOLhB9BZ

      1 reply 2 retweets 1 like
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    2. Health Nerd‏Verified account @GidMK 8 Sep 2019

      Basically, when mothers were stressed their kids had worse mental health To be honest, that's not a huge finding in my opinionpic.twitter.com/gwj1IdxgkJ

      1 reply 1 retweet 4 likes
      Show this thread
    3. Health Nerd‏Verified account @GidMK 8 Sep 2019

      Thing is, this study also had some ~serious~ problems For one thing, the sample size seems big, but the number of kids who developed mental health issues was just 40 out of 3600!pic.twitter.com/J6ixcqTm9S

      1 reply 1 retweet 4 likes
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    4. Health Nerd‏Verified account @GidMK 8 Sep 2019

      They also really didn't control for many things - while this may have been due to sample size, it seriously limited the conclusions

      1 reply 1 retweet 4 likes
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    5. Health Nerd‏Verified account @GidMK 8 Sep 2019

      They didn't, for example, control for maternal alcohol or drug intake, which can both have a HUGE impact on childrens' mental health

      1 reply 1 retweet 5 likes
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    6. Health Nerd‏Verified account @GidMK 8 Sep 2019

      The absolute risk increase was also pretty miniscule Kids exposed to no stress had a 0.5% risk of developing personality disorders Kids exposed to some stress had a 1.6% risk Triple the odds, but only 1.1% risk increase!pic.twitter.com/qTpdRcW2oP

      1 reply 1 retweet 5 likes
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    7. Health Nerd‏Verified account @GidMK 8 Sep 2019

      Also, the study assessed stress using one questionnaire given partway through the pregnancy in 1975, which I'd argue is...problematic

      1 reply 1 retweet 4 likes
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    8. Health Nerd‏Verified account @GidMK 8 Sep 2019

      On top of all of this, the study used a statistical technique called logistic regression Without going into the details, this is very questionable for a study like this

      1 reply 1 retweet 2 likes
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    9. Health Nerd‏Verified account @GidMK 8 Sep 2019

      Basically, if you have too few outcomes (i.e. only 40) in your sample, and include a bunch of covariates in the statistical model, you end up with a bit of a meaningless result I mean, just look at those confidence intervals!pic.twitter.com/kIKGKcoSov

      1 reply 1 retweet 5 likes
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    10. Health Nerd‏Verified account @GidMK 8 Sep 2019

      (As a side note, there appear to be a few numerical errors in the paper, such as this one in the table above)pic.twitter.com/XB7m1aiQ20

      1 reply 1 retweet 3 likes
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      Health Nerd‏Verified account @GidMK 8 Sep 2019

      If you read that table, kids exposed to "any" stress have 3.37x the odds of having any diagnosis of personality disorders, but the confidence interval goes from 1.61x to 7.07x That's ~huge~

      10:59 PM - 8 Sep 2019
      • 1 Retweet
      • 2 Likes
      • Kristy Schwartz, MD, MPH pacemaker_FGC Heather McEwen
      1 reply 1 retweet 2 likes
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        2. Health Nerd‏Verified account @GidMK 8 Sep 2019

          TL:DR: - association between stress in pregnancy and kids getting personality disorders - very weak - risk increase is tiny - statistical analysis is problematic - HUGE potential for residual confounding - ALMOST CERTAINLY NOT SOMETHING FOR MUMS TO WORRY ABOUT

          1 reply 1 retweet 6 likes
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        3. Health Nerd‏Verified account @GidMK 8 Sep 2019

          Now, while the media certainly had a role to play in the misinterpretation of this study, I think the problem started in the conclusions This is not well worded at allpic.twitter.com/cIm8jvpLvi

          1 reply 1 retweet 4 likes
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        4. Health Nerd‏Verified account @GidMK 8 Sep 2019

          The authors have been quoted elsewhere saying that this definitely isn't causal, but if you read the conclusions of the study it sounds like it absolutely is That's a huge problem

          1 reply 1 retweet 8 likes
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        5. Health Nerd‏Verified account @GidMK 9 Sep 2019

          Blog up on thishttps://medium.com/@gidmk/dont-stress-too-much-about-pregnancy-stress-d933eb377b8c …

          0 replies 0 retweets 1 like
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        6. End of conversation

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