pediatric BMI percentile

[Matt King]

MU requirements use BMI percentile for patients between 0-18 yr of
age. standard pediatric growth charts plot height (or length) versus
weight and display in in a percentile graph. Question: Wouldn't the
percentile of the height and weight graph be exactly the same as the
BMI percentile graph? I don't understand why it would be different.
Can someone help me on that?

thanks,

matt

[David Whitten]

I'm not sure either, but I seem to recall that as you get taller that
your volume increases
at a cubic rate, whereas your height/weight would just be a linear relationship.
Do I remember correctly that the BMI (Body Mass Index) is calculated at
the weight divided by the square of the height with maybe a Finnegan's
Finagle Factor
to handle the issue of alternate units?

Perhaps some of the statisticians among us can tell us the details.

David

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[Matt King]

Ok, that explains it. Thanks, David,
m

[Nancy Anthracite]

Yes, but the percentiles are based on data in tables sort of thing, based on
population studies so I would think that a certain height and weight should be
very close to the same percentile as the BMI within a small error because of
fitting the data to the equation used to figure the percentiles.

--
Nancy Anthracite

[Matt King]

Nancy,
You may be right. However, Kevin's latest Growth Charts have BMI
percentile as you reminded me offline. Do you know the latest KIDS
build and location for that?

thanks,

m

On Feb 2, 9:35 am, Nancy Anthracite <nanthrac...@earthlink.net> wrote:
> Yes, but the percentiles are based on data in tables sort of thing, based on
> population studies so I would think that a certain height and weight should be
> very close to the same percentile as the BMI within a small error because of
> fitting the data to the equation used to figure the percentiles.
>
>
>
>
>
>
>
>
>
> On Thursday, February 02, 2012, David Whitten wrote:
> > I'm not sure either, but I seem to recall that as you get taller that
> > your volume increases
> > at a cubic rate, whereas your height/weight would just be a linear
> > relationship. Do I remember correctly that the BMI (Body Mass Index) is
> > calculated at the weight divided by the square of the height with maybe a
> > Finnegan's Finagle Factor
> > to handle the issue of alternate units?
>
> > Perhaps some of the statisticians among us can tell us the details.
>
> > David
>

[mish]

BMI = Weight (lb) / (Height (in) x Height (in)) x 703. So for English
units Mr Finagle is 703.

Mr. Finagle is banished in metrics multiverses...
BMI = Weight (kg) / (Height (m) x Height (m))

[David Whitten]

On Thu, Feb 2, 2012 at 12:32 PM, mish <prof...@gmail.com> wrote:
> BMI = Weight (lb) / (Height (in) x Height (in)) x 703.  So for English
> units Mr Finagle is 703.
>
> Mr. Finagle is banished in metrics multiverses...
>  BMI = Weight (kg) / (Height (m) x Height (m))
>

For that equation, his Finagling Factor may just be equal to the number 1.
But I have been assured by several engineers that I know that he still has
a presence even among the metric worlds. His buddy Murphy has been
spotted also...

[kdt...@gmail.com]

Matt,

Email me offline, and I'll have Eddie send it to you...

Kevin