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[Equipment] changing pressure seems to alter historical data
I have a VPAP-S S8 machine. Even though I bought the special card reader and data card, I am unable to use software.

So, second best, I go into the results menu and read out my AHI and AI.

I did a pressure change in December: IPAP and EPAP up 0.6 cm-H2O.
The data in history appears to have changed. The day, week, mo data are valid now.

I speculate that changing pressure invalidates summary data not yet calculated..
It appears that the machine carries the valid short term average data back to 3mo, 6mo and 1year.

Anyone else see this behavior?

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