OK everyone, thanks for all your input. I understand how the machine arrives at those numbers, and I think I've decided now that it doesn't really matter that much to me. I'll just concentrate on getting used to sleeping while hooked up to this contraption and look forward to one day waking up feeli...

I'm a total CPAP newbie, having had my F&P HC608 for just on a week now. I know that the only data available is "compliance", but I've had a look at it and I can't understand what it really means. The two figures available on the display are "Total hours of operation" and "Average compliance hours p...