Doesn't matter what the machine says your AHI is if you didn't sleep. That's why I said the data shown is useless.
The machine can't tell if you are awake or asleep ...it only measures flow rate and our breathing while awake is very irregular when compared to asleep breathing and the machine can and will flag awake breathing irregularities as some sort of apnea event. I call them false positive flags.
Explained a bit in the videos here
and while it talks mainly about Clear Airway/Central apneas the false positives aren't limited to centrals...we can have false positive OAs and hyponeas as well. I know because I have had them myself.
Yes...EPR is set to 3 cm but you aren't getting that 3 cm reduction during exhale when the machine is still in ramp because the ramp pressure is 4 cm and the machine simply can't go below 4 cm.
When ramp ends and the pressure is at 5 cm...you get only 1 cm of that 3 cm EPR available again because the machine can't go below 4 cm.
To get the full benefit of EPR at 3 cm you need to be at 7 cm.
What position do you primarily sleep in? Does the wife say if you snore much when you are on your side?