AHI calculcation in SH vs CPAP and MyAir

[BlueDragon]

I've noticed occasional discrepancies between the AHI displayed on the CPAP machine (and also reported in MyAir) vs Sleepyhead. Last night, SH reported AHI of 0.32 and the machine and MyAir reported 2.8. Looking at the numbers, it would appear that the machine includes the number of large leak events in its AHI calculation, while SH does not. (I had 25 large leak events last night because of a mask issue.)

Is this correct?

[palerider]

I've noticed occasional discrepancies between the AHI displayed on the CPAP machine (and also reported in MyAir) vs Sleepyhead. Last night, SH reported AHI of 0.32 and the machine and MyAir reported 2.8. Looking at the numbers, it would appear that the machine includes the number of large leak events in its AHI calculation, while SH does not. (I had 25 large leak events last night because of a mask issue.)

Is this correct?

That is not correct.

AHI is Apnea Hypopnea Index. Apneas + Hypopneas / hours of use.

You'll have to dig deeper to see where the discrepancy is. It may be the reporting period.

[Uff Da]

I had the same problem with discrepancies between Sleepyhead and ResMed on August 1. Some of the regulars on this forum gave me some ideas of what might be the cause. I still haven't figured it out and I had more problems a couple of times in the last week. I haven't added the details of those issues to my thread yet, but will try to find time later today or tomorrow to do so.

Anyway, you might want to check out the input people had on my similar issues in this thread:
viewtopic/t172484/Major-discrepancy-bet ... d-AHI.html

[BlueDragon]

OK, so LL isn't the issue. Still, something very odd is going on with SH and ResScan/MyAir/CPAP not agreeing.

I compared ResScan and SH. Both have the same reporting period of 9:26 hours. There are two sessions. Both programs agree about 3 events in the first session. ResScan reports a large number of events in the second session, while SH reports none.

fwiw, I use FlashPap to transfer data from the SD card to my computer, and then import it into SH. I tried importing the data directly from the card to my existing SH user, with no change in results. However, when I created a new user in SH and imported all data again, SH then agreed with ResScan. That would seem to narrow the possible culprits to SH and FlashPap.

Is there a way in SH to delete a single day's data? If so, I'll delete 8/13 and try importing again from both FlashPap and the card to see if that shows anything different.

Suggestions welcome!

20180814-SH vs RS.png

2018-08-13 Resscan.png

[Pugsy]

Try creating a new user profile in SleepyHead and importing again.

[BlueDragon]

Try creating a new user profile in SleepyHead and importing again.

Yes, I did try that, importing both from the SD card and from FlashPap. With a new user, both imports worked (i.e., agreed with ResScan).

So, what's wrong with SH that it intermittently doesn't get all the data (or whatever it is that is going wrong)?

[Pugsy]

So, what's wrong with SH that it intermittently doesn't get all the data (or whatever it is that is going wrong)?

It's Beta software so buggy...though this is a rather new bug.

[BlueDragon]

It's Beta software so buggy...though this is a rather new bug.

Is there someone I should pass this on to? Where?

[Pugsy]

There is but Mark has supposedly been working on another new version of SleepyHead which has yet to be released so I don't know that he will care about bugs in the older version.

memberlist.php?mode=viewprofile&u=54879

I don't know how often he checks PMs here.

[palerider]

There is but Mark has supposedly been working on another new version of SleepyHead which has yet to be released so I don't know that he will care about bugs in the older version.

memberlist.php?mode=viewprofile&u=54879

I don't know how often he checks PMs here.

It might be a bug that carries over.

You'd probably be better able to get in contact via his sleepyhead facebook page: https://www.facebook.com/groups/sleepyheadcpap/about/

[Pugsy]

It might be a bug that carries over.

Yeah, but it's odd that it's just now happening and to just a couple of people maybe.

I haven't had it happen once and I have had my AirSense right at a year now.

[BlueDragon]

According to notes on the Discord board, Mark is focused intently on a new version now, so bug reports may not be handled immediately. I'll wait for an update. SH is still the tool I like best for looking at what's happening.

All software has bugs.

Recently, I had two days with 11 hours sleep each (in multiple, short sessions as I was ill). One of the sleep sessions went from about 11 am to 2 pm. The CPAP nicely broke that into two sessions at noon sharp. However, SH managed to put 18 hours in one "day" and 4 hours in another, and didn't get the AHI computed reasonably. ResScan, on the other hand, put 11 hours in one day, and about 2 hours in the next and apparently discarded the other sessions. Only MyAir got it right, with two days with 11 hours of usage each.

[palerider]

It might be a bug that carries over.

Yeah, but it's odd that it's just now happening and to just a couple of people maybe.

I haven't had it happen once and I have had my AirSense right at a year now.

Yeah, it is weird.

[Jas_williams]

Some times I have seen sleepyhead fail to import a day correctly. My answer find the day, open data => advanced => delete current day

Then reimport normally fixes the issue.

[BlueDragon]

Some times I have seen sleepyhead fail to import a day correctly. My answer find the day, open data => advanced => delete current day

Then reimport normally fixes the issue.

Thanks for pointing me to the data delete function. Tried that, and unfortunately it didn't make any difference. Still had the incorrect import.