What is average and what does it mean?

I was met with frustration again this week when I was discussing something with a medical provider and she did not seem to understand some basic math terms that are used all of the time in the medical field. The specific point was the "median" life expectancy for those with Propionic Acidemia. Nothing has changed in the past 9.5 years and the median life expectancy remains at 3.5 years.

Median is the middle number when you are looking at a series. So in the series 1, 3, 5, 8, 9, 15, 17, 23, 49-- 9 is the median as it is the middle number. So to get 3.5 years as the median life expectancy in PA there are an equal number of affected individuals dying under age 3.5 years as those older than 3.5 years. Median is useful in describing a set of data or series where the numbers are in a far reaching range.

Mean is what people usually think of when they talk about averages, it is when you take a set of numbers and add them and then divide by how many numbers in the series. So looking at the same numbers above- 1, 3, 5, 8, 9, 15, 17, 23, 49-- Add them 1+3+5+8+9+15+17+23+49=130. Then divide 130 by 9 as there were 9 numbers in the series- 130/9=14.44

So with the same set of numbers the median and mean can be very different.

I was upset because this medical provider was telling me that propionic acidemia was not life threatening, when it is even when you are past the median life expectancy. She was essentially telling me that since she is older we don't have anything to worry about-- no, we do. We have to continue to be careful and cherish everyday because it is not known how long she could have. So shame on her for passing on misinformation from a person who should know these basic math concepts.

Pounding the Pavement for PA

On October 16th, I will be joined by several other parents and friends of those affected by Propionic Acidemia in Columbus, OH. We will be running in the Columbus Nationwide Half Marathon. Our goal is to raise $13,100 for the Propionic Acidemia (PA) Foundation, that is $1,000 for each mile of the race. My personal goal is to raise $4,000. I will donate $1 to the PA Foundation for each mile I run in training and in events. I will also be running in the Hot Chocolate 15K with my husband, Rawlo, on November 5th in Chicago.


HOT CHOCOLATE 5K 2010
Ryan, Jill's son on the left, I am in the center, and Jill, President of the PA Foundation is on the right

The PA Foundation is dedicated to finding improved treatments and a cure for Propionic Acidemia by funding research and providing information and support to families and medical professionals. I have been on the board of directors for the past 5 years and we try very hard to make sure we get the most out of the funds donated.

PA is a tough disorder. Talli has faired well compared to most others that we know of, but we do not know how her life will play out or for low long. PA can cause seizures, low muscle tone, developmental delays, cardiomyopathy (enlarged, weakened heart), Long QT Syndrome, low blood cell counts, osteoporosis, stroke, suppressed immune function, optic and auditory nerve atropy, pancreatitis, and very early death.

Please make a donation to the PA Foundation. You can do so through the Paypal link at http://www.pafoundation.com/, through my Firstgiving page at www.firstgiving.com/fundraiser/brittany-smith-2/poundingthepavementforpa, or send a check payable to Propionic Acidemia Foundation at 1963 McCraren Rd., Highland Park, IL 60035.

You can follow the progress of my training on the Firstgiving link above.


Talli October 2010



Talli October 2001, her first "crisis"

And there are always angels

There is another little angel in heaven.

For the past week, I have been talking and texting with another mom whose daughter has Propionic Acidemia (PA). There was also a lot of talk with a mutual friend as one of us might have a new piece of news on the little girl. At times, she would be doing better, then take a turn for the worse. Yesterday things did look better, but this morning they decided that no more could be done for her and took her off life support.

There is always sadness, survivor guilt for those of us who still have their children, and some happiness and peace for the child who does not have to deal with tubes or pokes any longer. Most of us know these things are coming as the life expectancy of PA is still only 3 years. This angel was 3.

Talli looks at me curiously when I tell her I am sad that someone died. It could be my grandmother or another child with PA. She tells me how they are with Jesus and are so happy.

May our newest Angel's mother have peace and the rest of us love our angels while we have them.