What is the ± value after mechanical properties in the Ultimaker PLA Technical Data Sheet (TDS)

[ttaiwo 1]

I have been comparing the benefits of some process changes to designs printed on our Ultimaker S3 through tensile testing. I am using the Ultimaker TDS and similar specimens to one tested in their TDS to validate our tensile testing procedure. However, next to most mechanical property values, they have an additional ±value. I am assuming it is just the standard deviation of all the samples they tested. However, I want to confirm this as it could be a confidence interval or something else. I haven't found any mention in the forums, and it doesn't seem to be explained, at least in the PLA TDS. 

 

Thanks in advanced

[Dustin 160]

its the standard or expected deviation value.

[ttaiwo 1]

@Dustin thanks for confirming this for me