Below a summary of responses to the question I posted a few weeks ago
on mean distance/ range of distances between the ischial tuberosities. I
would like to thank all of you who responded. Following the question I asked
with the replies

Dear all,

does anyone know if there is some information available regarding the mean
distance/ range of distances between the ischial tuberosities
in a seated position? Ideally I am looking for some anthropometric
tables of the German/European population.
I would be very appreciative if any of you could give me
advice, suggestions or references regarding this problem
Thank you for your time and consideration in advance

Sonja Hermann, MSc


I can not think of any such specialized information document at this time,
but I bet there are more than one that deal with the sitting
pressures. However, I think that most of the technical articles I have
on the subject have a grand sample size of one! They are only
feasibility studies.

In the meantime, I suggest that you use an estimate for the mean of .25
times the Bitrochanteric Breadth (Hip Breadth, standing) for the
populations you have in mind. The standard deviation would probably be
close to .25 times that of the standard deviation for the Bitrochanteric
Breadth, though perhaps less because of the absence of fatty tissue in
the bones.

John Roebuck, MS
Anthropometry Consultant
Roebuck Research and Consulting

Kath Bogie wrote

2 older references on European wheelchair users
which may contain the dimensions are:

Fenwick D. Wheelchairs and their users.
Office of Population Censuses and Surveys. Social Survey Division, HMSO,
Seating for elderly and disabled people.
Inst. Consumer Ergonomics, University of Technology, Loughborough, 1983.

You may also want to try contacting the ICE directly to see if they can
help you:
ICE Ergonomics, Holywell Building, Holywell Way, Loughborough, LE11 3UZ
Tel: +44 (0) 1509 283300
Fax: +44 (0) 1509 283360

Kim Burton wrote

You should find the info in a PC program called PeopleSize from

Kim Burton
Editor-in-Chief, Clinical Biomechanics
Spinal Research Unit
University of Huddersfield
30 Queen Street
Voice +44 1484 535200\human+health/research/sru/sru.html

Graham Coleman wrote

Try PeopleSize Software (
It gives the distance between inner edges of the ischial tuberosities
and their width.

Graham Coleman

Graham Coleman Associates
Ergonomics Consultancy.


There is some anthro data on ITs in the new publications by the UK
Department of Trade and Industry. Contact Paul Hale at Data for several different populations are available.


Jeff Lewin
Sr. Human Factors/Ergonomics Engineer
Seagate Technology

You can try the book titled "Bodyspace-- Anthropometry, Ergonomics and
Design", Author: Stephen Pheasant, published by Taylor & Francis, 1986,
Reprinted 1988, 1990, 1992, 1994.

Yu Li (Ph.D)
Department of Anatomy
Bristol University

I don't know whether you have your answer yet, but in 'Adultdata', which is
produced by the Department of Trade and Industry here in the UK, I found:

UK, male, mean (SD) 117.9 (11.3), 5th / 95th %tile: 99.4 / 136.5, female
129.4 (10.1) 112.7 / 146.1
USA, male 118.3 (11.4) 99.5 / 137.1, female 129.9 (11.1) 111.7 /
The booke quotes as its source "PeopleSize 1998", which is a
More info on that at

Hope this helps,
Jan Herman Kuiper


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