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+--- Thread: Can anyone tell me from this screenshot what Oscar is using as my baseline SpO2 level (/Thread-Can-anyone-tell-me-from-this-screenshot-what-Oscar-is-using-as-my-baseline-SpO2-level)
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Does anyone know what OSCAR uses to compute its SpO2 Baseline? - mikep118 - 01-09-2023
Does anyone know what OSCAR uses compute the SpO2 Baseline that it uses. Its obviously very different from what the Bellevue O2 Ring uses and my defats are way way higher than is showing on my O2 Ring result report. As was pointed out to me on this forum this makes a big difference on the number of 3% desaturations computed. I know the ring considers a 4% drop a desaturated while Oscar considers a 3% drop a event but still im going from 1 desaturated drop on my O2 ring report to 88 from the same session on my Oscar report.
thanks
Mike
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - srlevine1 - 01-09-2023
Have you reviewed the options at File > Preferences > Oximetry tab where you can change how the information is reported to suit your needs?
Hope this helps.
Steve
Can anyone tell me from this screenshot what Oscar is using as my baseline SpO2 level - mikep118 - 01-09-2023
Im trying to figure out what Oscar is using as my baseline SpO2 level to then determine how many desaturation events im having every night. Ive attached a screenshot below. In the little window on the left side it says Min. 90 Med. 96 then 95% and 95.5%. Are any of these my baseline? On this session its showing 12 SpO2 defats, is im assuming this means 12 times my oxygen dropped 3% form the baseline? Is that correct? Even more confusing im pretty sure the Bellevue sleep result report form the same session is showing a different baseline than Oscar is because the amount of defats is less. Im still new to this so im just trying to figure it all out.
Thanks
Mike
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RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - mikep118 - 01-09-2023
(01-09-2023, 10:50 PM)srlevine1 Wrote: Have you reviewed the options at File > Preferences > Oximetry tab where you can change how the information is reported to suit your needs?
Hope this helps.
Steve
Thanks for the reply, yes I have tried this but it doesn't seems to change anything. Have you had luck doing this?
Mike
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - srlevine1 - 01-09-2023
It works for me, but I am using a ResMed-integrated pulse-ox system.
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - mikep118 - 01-10-2023
(01-09-2023, 11:58 PM)srlevine1 Wrote: It works for me, but I am using a ResMed-integrated pulse-ox system.
Ok maybe thats why.
Thanks
Mike
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - pholynyk - 01-10-2023
Digging through the code, I found the SpO2 routine; It appears to use the median of the first hour of data as the baseline SpO2 value.
If that routine is called, you will find, in the debug text, a line that says "Calculated baseline" followed by the value.
I can't find where the routine gets called by the Viatom style oximeters; I think it gets called when the summary data is calculated. It's odd, then, that the roune is called from the serial oximetry loader, since it will get called by the summary calculations.
But anyway, it's the median value from the first hour. This strikes me as too long, but I don't know if there is an established definition. - Sorry!
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - mikep118 - 01-10-2023
(01-10-2023, 04:48 AM)pholynyk Wrote: Digging through the code, I found the SpO2 routine; It appears to use the median of the first hour of data as the baseline SpO2 value.
If that routine is called, you will find, in the debug text, a line that says "Calculated baseline" followed by the value.
I can't find where the routine gets called by the Viatom style oximeters; I think it gets called when the summary data is calculated. It's odd, then, that the roune is called from the serial oximetry loader, since it will get called by the summary calculations.
But anyway, it's the median value from the first hour. This strikes me as too long, but I don't know if there is an established definition. - Sorry!
Cool, thanks for digging into it. Just to clarify when you say it's the median value from the first hour, your talking the average from the first hour correct?
Thanks again
Mike
RE: Does anyone know what OSCAR uses to compute its SpO2 Baseline? - pholynyk - 01-10-2023
No... there is a difference between median and average. To get the avaerage, you add up all the values and divide by the number of values. The median is found by counting the number of values, then sorting all the values from low to high, and finally, finding value in the middle of the sorted list. There will be as many values below as above the median value..
The median and the average can be close in value, unless the values are skewed high or low.
RE: Can anyone tell me from this screenshot what Oscar is using as my baseline SpO2 level - YouTakeMyBreathAway - 01-20-2023
The baseline changing each night actually adds variance to the SD stat. Would absolutely love the option to manually set my baseline if anyone would be able to add this That'd be very valuabe
In particular, on nights that I have fewer drops, my baseline will be higher, causing the reported number of drops to end up similar despite my drops being much less...