Periodic breathing question

I happened to check my cpap information and I show 7 day average of periodic breathing of 3% and 30 day 2%.

Should I be concerned?

Not necessarily...do you spend much time awake with the mask and machine on?
What is your AHI AND the event category breakdown? Do you have many Clear airway events happening during the period of time that gets flagged with PB?
You will need the software to answer the Clear airway question. Sleepyhead will work with your machine and links for it are in my signature line.

The problem with 'averaging' is that you could have a few very high nights and a few very low nights (or maybe all the same)... it's hard to tell if you don't have the software AND/OR you don't take daily notes of your machine LCD statistics. Stress, too much alcohol, leaks and many other factors can all impact your PB number on any given night.

It should be noted that your percent of PB is still in the low range, however if I were you I would keep an eye on it and let us know if there is an upward trend. As Pugsy mentioned: Install Sleepyhead and post some graphs. The details of downloading and installing and posting are all in the first link in her signature space. It's up to you if you want to install the recently released version 0.9.8 ... maybe safer to install version 0.9.6 for now and let things settle down with the newest version.

If you are interested, here's a reference to the latest Sleepyhead version, note the word testing:
viewtopic/t101108/SleepyHead-0981-Testing-Builds.html