+- Apnea Board Forum - CPAP | Sleep Apnea (https://www.apneaboard.com/forums)
+-- Forum: Public Area (https://www.apneaboard.com/forums/Forum-Public-Area)
+--- Forum: Software Support Forum (https://www.apneaboard.com/forums/Forum-Software-Support-Forum)
+--- Thread: Extremely Large Negative AHI's (/Thread-Extremely-Large-Negative-AHI-s)
Extremely Large Negative AHI's - rafimf - 03-05-2021
In reviewing my Oscar data I came across 4 days with very large negative AHI's (in the 10's of thousands). The first session in each of the four days were also negative hours (in the 100 of thousand hours) and probably the reason that the ahi's were negative.
Obviously these are corrupted data, but any idea why they are occurring? Is my CPAP machine failing?
How do I delete these days so that don't affect my statistics?
RE: Extremely Large Negative AHI's - Crimson Nape - 03-05-2021
Go to those days with the negative values and use the Data > Advanced > Purge Current Selected Day. After purging any or all the days, you might try reimporting the data to see if it corrects it.
RE: Extremely Large Negative AHI's - Gideon - 03-05-2021
Which version of OSCAR are you using? or are you still using SleepyHead as your profile indicates?
We definitely corrected a similar issue in an earlier version of OSCAR so let's make sure you have the current version.
RE: Extremely Large Negative AHI's - rafimf - 03-06-2021
Thank you both for your replies. Your help was most appreciated. Indeed, I was not using the latest version. After installing it, the problems with negative ahi's and sleep hours were corrected!
I have since noticed a period of about 70 days that all data were missing (from mid Nov 2020 to late January 2021) but all data below Pressure Data on the overview charts were missing for 435 days.
Is there an explanation for the data gaps .... why some data items are missing but other are recorded?
I tried re-importing from the memory card but the data gaps remain. Do I need to take other steps prior to re-importing?
RE: Extremely Large Negative AHI's - Crimson Nape - 03-06-2021
Your SD card holds only so many days worth of detailed data. After that, it will have only summary data. If you didn't backup your SD card to your PC (Highly recommended), maybe you had the backup option turned on in your previous version. You will need to look for a folder in your OSCAR_Data > Profiles > YourUserName > CPAP-Name+S/N > Backup.