AHI - how is it calculated (Encore Basic)

General Discussion on any topic relating to CPAP and/or Sleep Apnea.
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RuthArt
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AHI - how is it calculated (Encore Basic)

Post by RuthArt » Mon Jan 26, 2015 6:21 pm

Here is last night, I'm doing much better but won't be able to see the Sleep Tech til February 20, so
I'm just keeping track of things for now. But I don't understand how the AHI is determined....I know
it's an average, but the percentages at the bottom of the page make me wonder how it works.

Image

I use a Nasal mask and end up having my nose tickle a couple of times per night and have to take
the mask off to scratch....what a nuisance. I really do need to learn to accept the pillows!

thanks for helping.

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Tatooed Lady
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Re: AHI - how is it calculated (Encore Basic)

Post by Tatooed Lady » Mon Jan 26, 2015 6:27 pm

That shows what percentage of events happened at what pressures, I believe?

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RuthArt
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Re: AHI - how is it calculated (Encore Basic)

Post by RuthArt » Mon Jan 26, 2015 6:33 pm

ok, so at the bottom, I see H at .6, 1.0, 2.8.....they are added (4.4) and then divided by 3? Is that how I got AHI of 1.0? (I mean that works, but
I wanted to be sure I had it right).

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palerider
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Re: AHI - how is it calculated (Encore Basic)

Post by palerider » Mon Jan 26, 2015 6:40 pm

RuthArt wrote: But I don't understand how the AHI is determined....I know
it's an average, but the percentages at the bottom of the page make me wonder how it works..
number of events/number of hours =ahi.

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RuthArt
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Re: AHI - how is it calculated (Encore Basic)

Post by RuthArt » Mon Jan 26, 2015 10:54 pm

well, the graph toward the top shows I had 6 events of various duration (or so I think); how does one have .6 events? or 2.8?
if I had 6 events and divide by 7.7 hours, I don't get 1.0 as the average. I need more clarification please

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palerider
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Re: AHI - how is it calculated (Encore Basic)

Post by palerider » Mon Jan 26, 2015 11:04 pm

RuthArt wrote:well, the graph toward the top shows I had 6 events of various duration (or so I think); how does one have .6 events? or 2.8?
if I had 6 events and divide by 7.7 hours, I don't get 1.0 as the average. I need more clarification please
you had 7 or 8, divided by almost 8 hours is around 1.

zoom in on that third one.

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Accounts to put on the foe list: dataq1, clownbell, gearchange, lynninnj, mper!?, DreamDiver, Geer1, almostadoctor, sleepgeek, ajack, stom, mogy, D.H., They often post misleading, timewasting stuff.

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RuthArt
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Re: AHI - how is it calculated (Encore Basic)

Post by RuthArt » Mon Jan 26, 2015 11:14 pm

well yeah, it's a thicker bar, but doesn't really tell me much. Maybe that was the 2.8. Oh, and during that
time, I don't think I was even asleep because I was having so much trouble getting comfortable. So how
do Hypopneas happen when one isn't sleeping??

Does Sleepyhead make it easier to read? (I worry that all the squiggles won't mean anything to me either)

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palerider
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Re: AHI - how is it calculated (Encore Basic)

Post by palerider » Mon Jan 26, 2015 11:24 pm

RuthArt wrote:well yeah, it's a thicker bar, but doesn't really tell me much. Maybe that was the 2.8.

Does Sleepyhead make it easier to read? (I worry that all the squiggles won't mean anything to me either)
an event is an event, there's no such thing as a 2.8 event, or a .6 event, or whatever. ahi is like apples and students.

you have so many apples, you have so many students, (event and hours) you don't go in with a .6 apple and a 2.8 apple and a .2 apple and a .4 apple, you go in with four apples. then you cut them up into equal pieces depending on how many students you have, so if you have 6 students, each gets 4/6ths, or 2/3rds, or .66 of an apple. same same with ahi. (except you can have a fractional student, (that 7.7 hours) (I also believe I've heard that encore rounds numbers funny, but I might be mistaken)

it's nothing more than simple averages, don't overcomplify the situation.

I'll bet that third tick mark represents more than a single event, if you zoom in closer. don't ask me how to do it with encore, I don't hate myself enough to use it... as far as I'm concerned, encore is for hard core professional masochists.

sleepyhead is so much better than encore that I can't even guess what to put in the sentence "sleepyhead is ______ times better than encore".

read pugsy's tutorial in the first post in announcements to start getting an idea what it all means.

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Accounts to put on the foe list: dataq1, clownbell, gearchange, lynninnj, mper!?, DreamDiver, Geer1, almostadoctor, sleepgeek, ajack, stom, mogy, D.H., They often post misleading, timewasting stuff.

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Sclark08
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Re: AHI - how is it calculated (Encore Basic)

Post by Sclark08 » Tue Jan 27, 2015 4:45 am

Sleepyhead much more user friendly