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What's the formula to convert 30day Ave's
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<blockquote data-quote="xyzzy" data-source="post: 258232" data-attributes="member: 40343"><p>Yes Grazer is right(ish) imo. </p><p></p><p>While just taking a 30 day average should get you quite close to increase accuracy you could mimic the testing regime of the 1000 odd diabetics who were used to build the HbA1c model. They tested 7 times a day doing a wake up then a before and two hours after every meal regime. As my wake up and before breakfast are the same I do a before and +2 hours after plus a +4 hour before bed. On top of that there is then a weighting to be applied. Effectively for even more accuracy you should be taking a 30, 60 & 90 day average and using a proportion out of each (can't exactly remember) to work out an overall weighted average. The more readings you have the better. My son who told me all this and implemented in his own spreadsheet reckons he gets within +/- 0.1% of his true HbA1c. However as Grazer said everyone is different so obviously those initial 1000 people didn't all register the same results! What they did was plot their scores and then did a regression analysis to work out the line of best fit on the data. So if you are close to that best fit line and mimic the same testing environment you should get very close to your actual HbA1c. If you are further away from the best fit line then you wont be so accurate no matter what you do. The best is to get one real HbA1c and then feed any discrepancy back in to your own formulas as an additional "me" weighting.</p><p></p><p>I don't do the 30/60/90 weighted average as to me my diet is pretty constant and my average levels are now only falling very slowly so for instance my 30 day average is now 5.2 and my 90 day average is now 6.0. In a few weeks time my 30 and 90 day average will likely end up the same so if we assumed they end up at 5.2 then it doesn't matter what percentage of the 90, 60 or 30 day average I take unless in the future I go mad and ignore my control for a period of more than a few days. So at the moment I take 20% of the 90 day and 80% of the 30 day as a good guess. Before I got to having 90 days of readings I took 80% of my 30 day and 20% of my overall average. Will see how good a guess in early April!</p></blockquote><p></p>
[QUOTE="xyzzy, post: 258232, member: 40343"] Yes Grazer is right(ish) imo. While just taking a 30 day average should get you quite close to increase accuracy you could mimic the testing regime of the 1000 odd diabetics who were used to build the HbA1c model. They tested 7 times a day doing a wake up then a before and two hours after every meal regime. As my wake up and before breakfast are the same I do a before and +2 hours after plus a +4 hour before bed. On top of that there is then a weighting to be applied. Effectively for even more accuracy you should be taking a 30, 60 & 90 day average and using a proportion out of each (can't exactly remember) to work out an overall weighted average. The more readings you have the better. My son who told me all this and implemented in his own spreadsheet reckons he gets within +/- 0.1% of his true HbA1c. However as Grazer said everyone is different so obviously those initial 1000 people didn't all register the same results! What they did was plot their scores and then did a regression analysis to work out the line of best fit on the data. So if you are close to that best fit line and mimic the same testing environment you should get very close to your actual HbA1c. If you are further away from the best fit line then you wont be so accurate no matter what you do. The best is to get one real HbA1c and then feed any discrepancy back in to your own formulas as an additional "me" weighting. I don't do the 30/60/90 weighted average as to me my diet is pretty constant and my average levels are now only falling very slowly so for instance my 30 day average is now 5.2 and my 90 day average is now 6.0. In a few weeks time my 30 and 90 day average will likely end up the same so if we assumed they end up at 5.2 then it doesn't matter what percentage of the 90, 60 or 30 day average I take unless in the future I go mad and ignore my control for a period of more than a few days. So at the moment I take 20% of the 90 day and 80% of the 30 day as a good guess. Before I got to having 90 days of readings I took 80% of my 30 day and 20% of my overall average. Will see how good a guess in early April! [/QUOTE]
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What's the formula to convert 30day Ave's
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