The reported data are for that night's use. Your local DME provider SHOULD check pressure output via a manometer at your request, at least once a year as part of routine maintenance. Check your User's Manual, highlight that paragraph and take it and your S9 in to your DME provider and point it out to them.
ResScan 3.10 - Resmed S8 ResLink & oximeter
ConTec CMS-50D+ oximeter - Philips EverFlo 5L Oxygen Concentrator
PR SystemOne BPAP Auto w/Bi-Flex & Humidifier - EncorePro 188.8.131.52