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I am currently working on a research problem dealing with repeated
measures and I am not sure if I using SPSS correctly to analyze the
data.
The problem is as follows:
I have a group of 20 patients who have been tested using two different
types of instruments, one to record their blood pressure (called
perfusion pressure) and the other to record the amount of oxygen that is
following through a certain part of the body (called the NIRS value).
Data for each of the patients has been recorded at 13 different levels
of pressure (starting at pressure 0 and going up to pressure 120).
However, there are several patients who do not have data for pressure
levels after 90 (the levels go from 0 to 120 by 10s). Also, the BMI
(body mass index) for each of the patients was measured and also needs
to be taken into account to see if this has any effect on the cuff
pressure.
Now, I am confused on how to use SPSS, particularly the GLM ->Repeated
Measures, to come up with the following:
I need to compare the perfusion pressure to the NIRS value to determine
a critical NIRS value when the perfusion pressure is zero. Also, I need
to see if the BMI of the patient has an effect on the values.
I have tried plugging the values in but I am not sure how to take into
account that I have 20 patients and I have at least 9 values recorded
for each patient for both their perfusion pressure and the NIRS value.
And are the results going to allow me to compare the two pressures to
one another?
It is a very confusing problem and I hope that I have made myself clear.
Any help that you can give me on this problem would be greatly
appreciated. Thank you very much.
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