It's been a long time since I had a sleep study. I recall being rigged up for measurements and can't recall whether there was a mask or not. The numbers are very bad, however. And I did have poor results at the end of the "life" of my first CPAP machine. But I stand corrected. Thank you.
I think he meant the sleep study is where the numbers came from. They don't wear masks then.
It's been a long time since I had a sleep study. I recall being rigged up for measurements and can't recall whether there was a mask or not. The numbers are very bad, however. And I did have poor results at the end of the "life" of my first CPAP machine. But I stand corrected. Thank you.