for the longest time I couldn't understand how some sensors last 5 days and some will last 11 days and some will last 9 days.
I want to know when they are going to fail to be prepared,for example if I have a big presentation next Tuesday should I change the sensor on Sunday or will this one go past Tuesday? every extra day I can squeeze out of a sensor is money I don't have to spend (especially when insurance won't pay for them).
so being the geek I am,I began logging calibration data to look for patterns. when the pump asked for a calibration I wrote down the date & time,BG value, sensor isig, then divided the isig by the BG to get what I'm going to call the sensor health ratio.after a year of recording data I started graphing the data and the pattern becomes apparent
the sensor generally fails when the linear (average or sometimes called best fit) line crosses 1.0 on the y axis
if anyone wants to check if they get the same results with their pump I can give you an excel file.