Different software - Different results

[Islandplans]

Hello,

Fairly new to the whole apnea/cpap world. Been quite overwhelming and complicated at times - as many of you likely are aware.

I have a Philips Dreamstation machine with a Resmed Quattro Air full face mask. My question is regarding software results.

I use both the Philips Respironics DreamMapper (mysleepmapper.com), software and also SleepyHead. I get different results each night between the two softwares.

For instance, last night DreamMapper gave a number of 4.6 AHI whereas SleepyHead gave a number of 3.53 AHI. The dreamstation machine itself displayed a 4.6. I have no idea why the discrepancy.

The only thing that I can imagine is that I am using a non-Philips mask. The machine has options for mask type, but only gives options (1 thru 5), for Philips masks. When contacted, Philips said they don't know the option since they only know their masks. Resmed wasn't sure so they suggested I turn the setting to 'off' - which is an option.

The mask type may have nothing to do with the discrepancy in readings, but I have no idea what else would cause this.

Any ideas?

Thank you.

[justMongo]

It's not the mask. There is a difference in the software. One of the SW experts likely knows why the difference.