The 10% +/- is actually from bodymedia's own research. They post it on their web site.
As for accuracy - I find the Gowear very accurate for me. I base this on how many calories the GWF estimates I burn, how many calories I put in and compare that to how many pounds I have lost.
I love it because I do not have a very easy to quantify day. Some days my job pins me down and even with exercise my burn is fairly low. But the very next day my burn might be as much as 800 calories more. Having the GWF means I can keep tabs on what is going on throughout the day and I am not just guessing and getting it wrong. Over time I have been able to see patterns in the data that make it easier to plan for what is to come.
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