Apart from my response yesterday, here are responses to Andy.
The title is deliberate and relates to the points I made yesterday.
The health effects are, as Andy says, predominantly due to physical activity and also
depend on the mode these transit journeys replace -or trips not made. One study isn't
generalisable but it is a good reminder to examine assumptions, such as Public
transportation always increasing PA levels (not that anyone on this list believes in never
or always, of course).
However, the average and range of the lengths of the journeys made, and the other options
available, probably vary widely not only between countries but also within countries.
London has far more buses and metro lines than anywhere else in the UK.
I am delighted that this paper is resulting in such widespread discussion!
We haven't published any Letters to the Editor yet, because we haven't received
any. Feel free to submit one but perhaps take into account my comments?
Regards
Jenny
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Today's Topics:
1. Re: Antwort: 'Transit Makes You Short' (mbrenman001(a)comcast.net)
2. Re: Antwort: 'Transit Makes You Short' (Sheryl Gross-Glaser)
3. Re: Antwort: 'Transit Makes You Short' (Andrew Dannenberg)
4. Re: Antwort: 'Transit Makes You Short' (ivanovb)
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Message: 1
Date: Thu, 1 Dec 2016 15:23:52 +0000 (UTC)
From: mbrenman001(a)comcast.net
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
To: "" <h+t--friends(a)chrispy.net>et>, ""
<thomas.goetschi(a)uzh.ch>
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Message: 2
Date: Fri, 2 Dec 2016 10:43:29 -0500
From: Sheryl Gross-Glaser <grossglaser(a)gmail.com>
Subject: Re: [H+T--Friends] Antwort: 'Transit Makes You Short'
To: TRB Health and Transportation <h+t--friends(a)chrispy.net>
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Maybe we can match height of riders with need for petite clothing - a
business opportunity. My petite daughters would appreciate that.
On Thu, Dec 1, 2016 at 10:23 AM, <mbrenman001(a)comcast.net> wrote:
What is "the power of large sample"? And of
course correlation is not
causality. One can imagine that in the us, transit riders are shorter than
car driver s, because of ethnic difference s in users. And there have been
various studies showing a correlation between height and higher pay, partly
due to gender disparities.
Marc brenman
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-----Original Message-----
From: thomas.goetschi(a)uzh.ch
To: h+t--friends(a)chrispy.net
Cc:
Sent: 2016-12-01 6:48:32 AM
Subject: [H+T--Friends] Antwort: 'Transit Makes You Short'
this may have some value for a journal club - I see flaws at various
levels. How it may contribute to our understanding of any possible
relationship between public transport and health escapes me.
Thomas G?tschi, PhD
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_____________________________________________________________
Universit?t Z?rich
Bewegung und Gesundheit / Physical Activity and Health
Institut f?r Epidemiologie, Biostatistik und Pr?vention
(eh. Institut f?r Sozial- und Pr?ventivmedizin)
Seilergraben 49
CH-8001 Z?rich
Schweiz
Tel: +41 44 634 50 68 <+41%2044%20634%2050%2068>
Email: thomas.goetschi(a)uzh.ch
www.ebpi.uzh.ch<http://www.ebpi.uzh.ch>
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[image: Inactive hide details for Ann Hartell ---12/01/2016 12:14:34
PM---I'm not sure how many on this list follow David Levinson's bl]Ann
Hartell ---12/01/2016 12:14:34 PM---I'm not sure how many on this list
follow David Levinson's blog The Transportist (over here: https:
Von: Ann Hartell <ahartell(a)gmail.com>
An: TRB Health and Transportation <h+t--friends(a)chrispy.net>
Datum: 12/01/2016 12:14 PM
Betreff: [H+T--Friends] 'Transit Makes You Short'
Gesendet von: h+t--friends-bounces(a)chrispy.net
------------------------------
I'm not sure how many on this list follow David Levinson's blog The
Transportist (over here: *https://transportist.org/*
<https://transportist.org/> ), but he recently published a post about a
working paper he co-authored with Alireza Emragun titled "Transit Makes
you Short": On Health Impact Assessment of Transportation and the Built
Environment.
The blog post is here:
*https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impact-on-public-health/*
<https://transportist.org/2016/11/28/u-study-says-transit-does-not-have-impact-on-public-health/>
The full paper is here:
*http://conservancy.umn.edu/handle/11299/179812*
<http://conservancy.umn.edu/handle/11299/179812>
Abstract:
The current research provides a test framework to understand whether and
to what extent increasing public transit use and accessibility by transit
affect health. To this end, the effect of transit mode share and
accessibility by transit on general health, body mass index, and height are
investigated, while controlling for socioeconomic, demographic, and
physical activity factors. The coefficient-p-value-sample-size chart is
created and effect size analysis are conducted to explore whether the
transit use is practically significant. Building on the results of the
analysis, we found that the transit mode share and accessibility by transit
are not practically significant, and the power of large-sample
misrepresents the effect of transit on public health. The results, also,
highlight the importance of data and variable selection by portraying a
significant correlation between transit use and height in a multivariate
regression analysis. What becomes clear from this study is that in spite of
the mushrooming interdisciplinary studies in the nexus of transportation
and health arena, researchers often propose short- and long-term policies
blindly, while failing to report the inherent explanatory power of
variables. We show that there is a thin line between false positive and
true negative results. From the weakness of p-values perspective, further,
we strove to alert both researchers and practitioners to the dangerous
pitfall deriving from the power of large- samples. Building the results on
just significance and sign of the parameter of interest is worthless,
unless the magnitude of effect size is carefully quantified post analysis.
~~~~~~~~~~~~
Ann Hartell
Doctoral Candidate
Institute for Multi-Level Governance and Development
Wirtschaftsuniversit?t Wien/Vienna University of Economics and Business
*https://www.wu.ac.at/en/mlgd/* <http://www.wu.ac.at/mlgd/en/>
Personal: *annhartell.com* <http://annhartell.com/>
Email: *ahartell(a)gmail.com* <ahartell(a)gmail.com>_____
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