CPAP function question - basic stuff...

[Gideon]

If I understand correctly, APAP reacts to the apnea events while ASV knows when the events is happening and apply the correct presure to eliminate them

You understand incorrectly.  

APAP responds to obstructive events After the event occurs by increasing pressure

ASV, to manage central events, maintains a constant volume, minute Vent with ResMed, based on a moving average of the volume by manipulating the PS to maintain that volume on the same breath that volume is decreasing and in so doing prevents a central apnea from happening.  ASV still depends on EPAP pressure to manage obstructive events

[Mandrake]

Another question, basic on Sleep Apnea:

Our goal is to get AHI down to below 5, and an AHI <5 from a sleep study will as far as I understand not even result in a sleep apnea diagnosis.
Does that mean that a majority of people out there would score >0 but <5 on a sleep study?
Or is it so that the average person, defined as the median, has an AHI of 0, but an AHI <5 is just considered such a minor issue that it is not in need of treatment?
What I am saying is that if we took a sleep study test on the entire population of the earth, what would the median AHI be? (average will obviously be >0, but median?)

And - if the median human being has an AHI score of 0.5, 1, 3 or whatever - are those only OA, or does the median human being have a few CA every night as well?

Sorry for all the questions, but I am just eager to learn and hoping that someone with the knowledge will take the time to answer.

Cheers!