# Re: [IP] Difference in readings

```Here's the scoop from Accu-Check on their "Health Care Professional
Information" insert.

All they give us is the statistical results of 15 tests with a mean of 68
and a standard deviation of 2.6. Then the same test with a mean of
160 and standard deviation of 7.6.  A 0.98 correlation coefficient over
a range from 35 to 552 does not indicate variance for our range of
interest of 50 to 200. An honest scientist would give the variance if
it were worse than assumed below.

Here is an example of what the test could have shown.

One big blood sample, test it 10 times, get these results
63, 65, 65, 67, 67, 68, 70,71, 71, 73

Next sample:
146, 150, 152, 155, 159, 161,165, 168, 170, 174

So 78 to 97 is a statistical unlikelyhood indicative of mechanical failure.

Aaron

>>> Christene Ullom <email @ redacted> 12/22 11:12 AM >>>
There is a difference of about 12% deviation from one test to the other.
Some machines are as high as 15% between tests and between machines.

Christene Ullom
If you think you're too small to be effective,
you've never been in bed with a mosquito.
- Raymond Sharp
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Insulin-Pumpers website http://www.insulin-pumpers.org/

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Insulin-Pumpers website http://www.insulin-pumpers.org/

```