#180 Incorrect pressure numbers/graphs with PR System One 561CA

[Teleute]

I'm getting some results that seem odd to me re: the pressure statistics vs. the graph. For example, one night, the pressure statistics are Min:9.10, Med: 8, 95%: 11 and Max: 11.5. These seem strange to me even on their own - how can the min be lower than the median? And why would the min be 9.10 if the machine is set to a min of 6?

And then, there's the accompanying graph:
http://s25.postimg.org/91qhdum3j/pressure_graph.png

This is from the same night. It never shows the pressure going as low as the stated min, or the stated median (let alone the actual machine min). Also, clearly the majority of the graph is showing a pressure above 11, despite the 95% number, and a max well over 11.5. Am I reading this incorrectly, or is there something strange going on?

While I've got some nights with strange data in that vein, I've got a couple of others like this - Min: 10.20, Med: 7.90, 95%: 12.00, Max: 12.60. Again, the min and median numbers seem bizarre on their own. And then the graph:

http://s25.postimg.org/b8uq1rrdr/pressure_graph2.png

Here the max and 95% numbers seem to be represented properly, but I can't see most of the graph as it falls below the bottom line...

Machine is a PR System One 561CA, computer is Windows 7, and SH version is 0.9.3.

I thought maybe I just had a setting wrong or was reading things incorrectly, but I posted this at cpaptalk.com and it was suggested that I file a bug report, so...here we are! :-) Thanks!

[Teleute]

Bah - I accidentally left the milestone at v0.8, and now it won't let me change it. Obviously this is post-0.8. :-)

[Teleute]

Okay, this is interesting. I switched it to use average instead of median, and now some of the graphs look more correct. In the first example above, I'm seeing stats of Min:9.10 (which is still weird - machine min is 6), Avg: 8.13, 95%: 11.00, and Max: 11.50. And the graph now looks like this:

http://s25.postimg.org/570vgi733/pressure_graph_avg.png

Which seems to mesh with the data.

However, the second one shown above is even funkier now. Stats are Min: 10.20, Med: 8.25, 95%: 12.00, Max: 12.60, and the graph is now:

http://s25.postimg.org/6akzsgrq7/pressure_graph_avg2.png

[matro]

hi there, I've experienced the same issue of Teleute, have a look at the following thread on cpaptalk.com: http://www.cpaptalk.com/viewtopic.php?f=1&t=95496&sid=c51b495a6e4bcb54213ecab5294eddee&p=886383.