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Glycaemic variability. What's yours and what do you consider high?

tim2000s

tim2000s

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Type of diabetes
Type 1
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Had quite a long discussion with the consultant this morning on the topic of Glycaemic variability (top: another item that can be used in a pump conversation).

Aside from the discussion about what causes it, his view was that my interquartile range 25th to 75th percentile range) was "quite high" and my deviation from median was extremely high given median level.

My mean was 6.5 mmol/l, median 6.0 and my Standard Deviation was 2.5mmol/l (which works out at 38% of my mean). Assuming a normal distribution (and I'm know we shouldn't) this would mean my 95th percentile range would be 1.1 to 11.9. Now I know for a fact that I haven't been that low, so we're working with a skewed distribution, but I'd be interested to know what yours is and whether your consultant thinks it's high!
 
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tim2000s said:
Had quite a long discussion with the consultant this morning on the topic of Glycaemic variability (top: another item that can be used in a pump conversation).

Aside from the discussion about what causes it, his view was that my interquartile range 25th to 75th percentile range) was "quite high" and my deviation from median was extremely high given median level.

My median was ~6.5 mmol/l and my Standard Deviation was 2.7mmol/l. Assuming a normal distribution (and I'm know we shouldn't) this would mean my 95th percentile range would be 1.1 to 11.9. Now I know for a fact that I haven't been that low, so we're working with a skewed distribution, but I'd be interested to know what yours is and whether your consultant thinks it's high!
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hmm Im on multiple injections, does that mean such percentiles and ranges wouldn't be discussed with me? My mean average based on finger pricks is 6.5mmol/l in the last week. Last week my consultant only focused on my HbA1c of 5.7 which she advised was too low... very interesting though!
 
For this clinic the data was wholly done from MDI, so it should be discussed. The consultant's line was Hba1C, whilst important, is only half the story. Variance is almost as important. (Much of the discussion at the Diabetes UK professional conference was on this topic).
 
My consultant has never discussed it with me and to be honest I have never looked into it on my meter. I try to deal with spikes/lows as it happens and never looked back into my data. Statistics has never been my favourite subject:)
 
According to Diasend (Libre data) I was median 6.3, std dev 2.2 for last 3 months. Will see what consultant says on Fri!
 
I've just signed up to Diasend and uploaded my libre results. Average of 6.9 and standard deviation of 2.4. I don't know whether that's good or bad I guess I will need to read up on it.

I think this is a little generous to me as I don't use the libre all the time and my variability is probably worse when I don't use it. Particularly for hypos.
 
Griffter15 said:
I've just signed up to Diasend and uploaded my libre results. Average of 6.9 and standard deviation of 2.4. I don't know whether that's good or bad I guess I will need to read up on it.

I think this is a little generous to me as I don't use the libre all the time and my variability is probably worse when I don't use it. Particularly for hypos.
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My endo says to aim to get the S.D under 2, that represents good control in his opinion
My last sensor had an s.d over 12 days of 1.6 if only it were always that good
 
Last 3 months: Average BG 5.8, SD 1.5
Last week: Average BG 5.3, SD 1.1

Edit to add, my consultant has never asked to see my BG records - he just goes on about my cholesterol ;)
 
my consultants don't want to discuss anything like this, or diet, or weight, or changes in insulin totals - only re my not taking statins, and blood pressure
 
Just looked at my Diasend. Mine is +/- 1.5 ... what are we supposed to be aiming for? Obviously as low as possible but is there a specific target for T1s?

Also, unrelated, but does anybody know how to change the reporting date range on Diasend?
 
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pinewood said:
Just looked at my Diasend. Mine is +/- 1.5 ... what are we supposed to be aiming for? Obviously as low as possible but is there a specific target for T1s?

Also, unrelated, but does anybody know how to change the reporting date range on Diasend?
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Top left corner of the screen.
 
just uploaded and ran a 2 monthset of averages

median 6.5
average BG 7.1
SD = 3.4
lowest reading 1.7 and highest 24.1

on those stats I am completely out of control :eek:
but an analysis of my data shows the 2 days where i had set problems and approx 12 hours of multiple high readings have skewed the curve immensely
 
My consultant's never asked about my deviation because 'your hba1c is great so you're doing really well' but I've been looking at it a lot because although my hba1c is fine I know I'm low a lot then end up spiking after.
For my last few weeks on CGM:
Average 6.2
Median 5.9
SD 2.0

But in comparison to before Xmas when I was working like crazy, had a mean of 5.7 but SD of 2.6 and was below my target range 27% of the time I think that's rather better, despite my hba1c being 'worse'.

I really think more consultants should take SD into account.
 
pinewood said:
do you know if there's any way to do it on the app?
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MySugr and DiaConnect do it automatically. The Libre data also shows it on the overview screen. That's what the ambulatory profile is.

Otherwise you have to do it on a spreadsheet.
 
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