Post
by robysue » Tue Nov 09, 2010 2:08 pm
Here's some help in interpreting the summary data you posted SnoozyQ.
First, the graphic summaries give you visual data for each day in your summary period, which is Sept. 14 to Nov. 5 in this screen shot.
The orange data is "compliance" data. The length of each orange bar indicates how long you used the machine each day. Days with mulitple orange bars are the days where you turned the machine on and off more than once. Sometimes if a given "mask event" is too short, it will show up as a thick black line.
The bars in the next chart represent your daily AHI and AI numbers, where the AHI and AI are computed on a noon-to-noon basis. The red sub-bar is your daily AI number: The S9 counts the number of apneas it detected and divides by the total number of hours the machine was run. The S9 tends to truncate fractions at the first decimal instead of rounding to the first decimal. So for example, if the S9 detected 10 apneas on a day the machine was run for a total of 6 hours, the AI would be listed as 1.6 even though 10/6 = 1.666667 = 1.7 if you round like you learned in grade school. The length of the white sub-bar on top of the red one represents the HI for the day---the number of detected hypopneas divided by the time the machine is run. So the total length of the red+white bar is the AHI for the day. Again, the AHI is the total number of apneas + hypopneas detected divided by the time the machine was run. The days where there is no red or white bar are the days where the S9 detected either no events, or so few events that the computed AHI and AI were both 0.0.
The blue bars in the next chart are for the pressure the S9 was running at. Since you're S9 is an Elite, which is straight CPAP, I don't really understand why a few of the bars are indicating that your median, 95%, and max pressures are not all equal to your prescribed pressure setting of 10cm. Maybe on those days, you were using the ramp really frequently?
The green bars in the last chart are for your leak data each day. Since there is NO dark, dark, green bar at the bottom of any of these bars, that indicates that your median leak rate on all the days shown is either equal to 0.0 or so close to it, that I can't see the dark green bar. The medium green bar represents your 95 percentile leak rate for each day. To my not very experienced eyes, your 95% leak data looks pretty decent---there's only one day where your 95% leak rate] is over 10 L/min. The light green bars represent your maiximum leak rate for each day. They're all over the place. Looks like some days you have at least one or two really bad (but short) leaks and other days you don't. The days where there is NO green bar at all are days where you hit a grand slam homerun in the leak department: You're median, 95%, and maximum leak rates are all 0.0 on those days---such as Nov. 2 and 5.
The numerical data in the second screen shot gives you summary data (averages) for the entire two week period that you selected. It's not yet clear to me if ResScan simply averages the daily numbers [i.e. adds up each of the daily numbers and divides by the number of days] or if ResScan does something more sophisticated in order to take into account the differing number of hours the machine is run each day.