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I'm using my CPAP machine since a month. Today, my machine and myAir app reports an AHI of 0.8 but oscar reports only 0.53. This is the first time I notice a difference between Oscar and my machine. What can explain that?
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.
RE: Different AHI reported by Oscar and my machine
Hello,
Seem like there is only one session. Yesterday, I noticed my tube was still wet at night because of the morning cleaning. I made the machine working with the mask leak test mode for some minutes to dry it. I don't see this time on oscar (I don't expect it, it's normal I guess?).
RE: Different AHI reported by Oscar and my machine
You seem to be talking about 3 different reporting sources, your CPAP, MyAir, and OSCAR. If you see a different value on your CPAP, the default reporting is a month. You can set the reporting period to daily, week, month, 3 months, and 6 months, too. The CPAP will reset back to a monthly reporting if you unplug it.
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.
RE: Different AHI reported by Oscar and my machine
Hello,
Yes 3 sources, but only one differs.
- CPAP machine (display results was set for 1 day, not the default of 1 month) and myAir for last night both reports AIH of 0.8
- Oscar is the only one reporting 0.53.
RE: Different AHI reported by Oscar and my machine
I can think of 2 possibilities.
OSCAR did not import all your sessions. Try reimporting to see if this corrects this.
The numeric resolution of the calculations between OSCAR (more digits) versus the other two can produce an overall difference. This is particularly true the more sessions you have in a day's data.
Quick math on an 8-hour sleep session equates to a 2 event difference.
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.
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.
06-11-2023, 07:37 PM (This post was last modified: 06-11-2023, 07:38 PM by GuyScharf.)
RE: Different AHI reported by Oscar and my machine
This is a rounding error caused by the different way ResMed programs and OSCAR determine the length of a session. ResMed software (MyAir, AirView, display on machine) rounds session lengths to the nearest minutes. If there are multiple sessions, the rounding occurs on each session before they are added together to determine total time for the day. AHI is then calculated as number of events / total time.
The CPAP machine records each session length in microseconds, which is what OSCAR uses in its calculations. When it then makes the AHI calculation, it has a slightly different total time than ResMed software so shows a slightly different AHI.
The difference in the resulting AHI is not clinically significant.
Apnea Board Monitors are members who help oversee the smooth functioning of the Board. They are also members of the Advisory Committee which helps shape Apnea Board's rules & policies. Membership in the Advisory Members group does not imply medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.
