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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. Darren Dahly, PhD‏ @statsepi 22 Jan 2020

      Darren Dahly, PhD Retweeted Johns Hopkins Bloomberg School of Public Health

      I got 100 bucks for anyone from @jhubiostat that can explain what was actually done in this paper! 😜 #statstwitterhttps://twitter.com/JohnsHopkinsSPH/status/1220003201165996033 …

      Darren Dahly, PhD added,

      Johns Hopkins Bloomberg School of Public HealthVerified account @JohnsHopkinsSPH
      "The largest apparent protective effect was found for children who had a household pet dog at birth or were first exposed after birth but before age 3" https://hub.jhu.edu/2020/01/06/dog-schizophrenia-risk-2499-em1-art1-rea-health/ …
      9 replies 2 retweets 23 likes
      Show this thread
    2. David Manheim‏ @davidmanheim 22 Jan 2020
      Replying to @statsepi @jhubiostat

      David Manheim Retweeted Johns Hopkins Bloomberg School of Public Health

      Oh! I know this one - it's HARKing. And it's why we need to preregister studies in epidemiology the same way we already require in medicine. https://journals.sagepub.com/doi/abs/10.1207/s15327957pspr0203_4 …https://twitter.com/JohnsHopkinsSPH/status/1220003201165996033 …

      David Manheim added,

      Johns Hopkins Bloomberg School of Public HealthVerified account @JohnsHopkinsSPH
      "The largest apparent protective effect was found for children who had a household pet dog at birth or were first exposed after birth but before age 3" https://hub.jhu.edu/2020/01/06/dog-schizophrenia-risk-2499-em1-art1-rea-health/ …
      1 reply 0 retweets 1 like
    3. Andrew Althouse‏ @ADAlthousePhD 22 Jan 2020
      Replying to @davidmanheim @statsepi @jhubiostat

      It's even worse than that. It's not just HARKing. The authors really seem to struggle with the connection between what they did and what they think they did.

      1 reply 0 retweets 6 likes
    4. Andrew Althouse‏ @ADAlthousePhD 22 Jan 2020
      Replying to @ADAlthousePhD @davidmanheim and

      For example, consider this passage in the Discussion: "Cox proportional hazard analysis indicated that exposure to a pet dog during the first 12 years of life was associated with an approximately 25% decreased hazard of having a subsequent schizophrenia diagnosis (Fig 1)."

      2 replies 0 retweets 2 likes
    5. Andrew Althouse‏ @ADAlthousePhD 22 Jan 2020
      Replying to @ADAlthousePhD @davidmanheim and

      Now go look at Figure 1. It's a KM curve of "time to getting a dog" with the groups being schizo, bipolar, and control. So a Cox model using this data would (presumably) not be "the hazard of having a schizo diagnosis for people with vs without dog" but rather...

      2 replies 0 retweets 3 likes
    6. Andrew Althouse‏ @ADAlthousePhD 22 Jan 2020
      Replying to @ADAlthousePhD @davidmanheim and

      ...it would be "the hazard of getting a dog for people who are eventually diagnosed with schizo versus not eventually diagnosed with schizo"

      1 reply 0 retweets 4 likes
    7. Andrew Althouse‏ @ADAlthousePhD 22 Jan 2020
      Replying to @ADAlthousePhD @davidmanheim and

      The charitable version of events, assuming the analysis was even done correctly, still is that the authors really struggle to understand the connection between the model they used and the inference that is appropriate to draw from it.

      3 replies 0 retweets 8 likes
    8. Darren Dahly, PhD‏ @statsepi 22 Jan 2020
      Replying to @ADAlthousePhD @davidmanheim @jhubiostat

      Extremely charitable.

      1 reply 0 retweets 1 like
      Health Nerd‏Verified account @GidMK 22 Jan 2020
      Replying to @statsepi @ADAlthousePhD and

      Looking at this in more depth, I'm even less enthused. The control group was a bunch of people picked from the same geographical area, and they report the results of a multivariate logistic regression model as relative risks 🙄

      9:02 PM - 22 Jan 2020
      • 4 Likes
      • Andrew Althouse Maaike Verbruggen armchair flaneur David Manheim
      1 reply 0 retweets 4 likes
        1. New conversation
        2. Health Nerd‏Verified account @GidMK 22 Jan 2020
          Replying to @GidMK @statsepi and

          Oh shit, just realized - they analyzed cross sectional data longitudinally. This was based on the reported age they were when their family got a pet, not a yearly data collection

          1 reply 0 retweets 3 likes
        3. David Manheim‏ @davidmanheim 22 Jan 2020
          Replying to @GidMK @statsepi and

          David Manheim Retweeted Johns Hopkins Bloomberg School of Public Health

          New study, rephrased: Less depressed people more likely to remember having a pet as a young child.https://twitter.com/JohnsHopkinsSPH/status/1220003201165996033 …

          David Manheim added,

          Johns Hopkins Bloomberg School of Public HealthVerified account @JohnsHopkinsSPH
          "The largest apparent protective effect was found for children who had a household pet dog at birth or were first exposed after birth but before age 3" https://hub.jhu.edu/2020/01/06/dog-schizophrenia-risk-2499-em1-art1-rea-health/ …
          0 replies 0 retweets 4 likes
        4. End of conversation

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