# Is Standard Deviation more important than average BG or Time-In-Range?

**URL:** <https://forum.fudiabetes.org/t/is-standard-deviation-more-important-than-average-bg-or-time-in-range/6479>\
**Category:** Treatment\
**Created:** [February 7, 2019, 12:37am UTC](https://forum.fudiabetes.org/t/is-standard-deviation-more-important-than-average-bg-or-time-in-range/6479 "2019-02-07T00:37:35Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![Trying](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/trying/32/4078_2.png) [@Trying](https://forum.fudiabetes.org/u/Trying)\
**Post date:** [February 7, 2019, 8:00pm UTC](https://forum.fudiabetes.org/t/is-standard-deviation-more-important-than-average-bg-or-time-in-range/6479/11 "2019-02-07T20:00:24Z")

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Question re: how lab a1c is calculated…

> [@ClaudnDaye](#):
>
> IF the low A1C is being achieved with a large number of severe lows then that isn’t healthy either.

But based on another [thread](https://forum.fudiabetes.org/t/why-a1c-can-be-different-from-ea1c-and-gmi/6491)

> [@Why A1c can be different from eA1c and GMI](https://forum.fudiabetes.org/t/why-a1c-can-be-different-from-ea1c-and-gmi/6491/1):
>
> The A1C, it is not a measurement of average. So lows don’t reduce it. A1C is a measurement of the amount of glucose that has bonded to the hemoglobin. So “average blood sugar” when used to describe A1C is somewhat over-simplified

So it seems that a1c does not get effected by lows, and in fact, they are not even considered. I guess one _might_ assume a PWD has lows if there avg BGs is rather high, but their a1c is lower than what would be expected. Is that the reasoning??

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