If your 02 is 68%, or even 75%, you’re likely about to be put in a coffin.
Patients with severe COPD/emphysema might have arterial oxygen levels in the mid to high 80s without supplemental oxygen
Which is not exactly the population this paper is trying to shed light on, but thanks for sharing his experience.
He has been on/off oxygen in the past and he's at that stage where he is waiting to kick the can, and is a very lucky man who has a wife of 66 years, who still takes care of him everyday.
I can guarantee if his wife passed, he would go the next day and that he is holding on because he knows how much she loves him.