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OSCAR and myAir
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07-13-2024, 10:13 PM
OSCAR and myAir
OSCAR and myAir seem to generally agree on AHI. But every now and then they differ significantly. Do they use different algorithms to calculate AHI?
RE: OSCAR and myAir
only thing that could really differ is the sessions shown bottom left in oscar. oscar by default will count all sessions for a day (between noon and midnight) unless you disable some, myair is slightly different i'm pretty sure it only shows the last session. i would disregard myair and disable some session in oscar if needed.
07-14-2024, 11:56 AM
RE: OSCAR and myAir
There can be 2 reasons for the variance. The first, is a reporting period difference. The Resmed will always reset to the default of a 30-day reporting period when it loses power. The second is least-significant bit truncation. I believe the Resmed uses 2 places to the right of the decimal, whereas OSCAR uses 8.
- Red
Crimson Nape
Apnea Board Moderator Project Manager for OSCAR - Open Source CPAP Analysis Reporter www.ApneaBoard.com ___________________________________ Useful Links -or- When All Else Fails: The Guide to Understanding OSCAR OSCAR Chart Organization Attaching Images and Files on Apnea Board Apnea Helpful Tips INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
07-14-2024, 03:37 PM
RE: OSCAR and myAir
Thanks. The difference seemed more significant than a rounding error. But, oddly, it seemed that the ResMed myAir number for the night also differed from the AHI number shown on the screen on my ResMed 11. The AHI number on the screen seemed to match the OSCAR number, but the screen number and the OSCAR AHI numbers were different from that shown on the myAir iPhone App. I notice that today the App does not work at all, due to "Scheduled System Maintenance" so maybe the odd difference is a one-off thing associated with work on the App.
Thanks for the insights! I'll keep an eye on it and see if it happens again after ResMed completes its system maintenance. |
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