(03-05-2016, 04:11 PM)rem52 Wrote: I have an A10 CPAP (brick) that I am trying to compare the different reports and I am getting apples and donuts for leak values.
The machine report shows 13L/min.,
and MyAir shows 'Mask Seal' 0 L/min.,
but then ResScan shows 3.6 L/min.
The machine's report is the 95% Leak rate. If the machine reports the leak as 13 L/min, that means that for 95% of the night your leak rate was AT or BELOW 13 L/min.
The MyAir "Mask Seal" number: I've looked on-line and I can find no information about how this number is computed, but I'm willing to take sonicboom at his word and say this is the 70% leak rate. A 70% leak rate = 0 means that for at least 70% of the night there was no detectable excess leak. This is the standard that has to be met for Mr. Green Smiley Face to show up on the S9's LCD. I don't know if the A10 has a similar Mr. Green Smiley Face/Mr. Red Frowny Face icon or not.
The ResScan number most likely is the arithmetical average or mean leak rate. Mathematically it's quite possible for the average of a set of data to be larger than the 70% for the data set: All it takes is a little bit of outlier data in the form of a relatively large maximum value.
Quote:Another night I get 11, 0, 14.40 all in L/min.
Again, the 11 from the machine is your 95% leak rate. For 95% of the night your leak rate was AT or BELOW 11 L/min
The 0 from myAir is the 70% leak rate. For 70% of the night your leak rate was 0 L/min. In other words, for at least 70% of the night the machine detected no excess leak
And if I had to speculate, I'd guess that you wound up focusing on the either average or maximum leak rate in ResScan. It's possible for the mathematical average of a set of leak data to be larger than the 95% if there's a short lived maximum leak that is quite a bit bigger than the 95% leak rate.