Abbott FreeStyle LibrePro Operator's Manual page 55

Overall Accuracy against BG Reference
Accuracy was measured by comparing the absolute relative difference between the System and
reference BG values. The absolute relative difference measures the level of disagreement between
the System and the reference value, but does not tell you whether the System glucose value was, on
average, higher or lower than the reference glucose value. The Mean Absolute Relative Difference
gives an indication of the average percent disagreement between the GM and the reference.
Table 6 shows the absolute difference measures by glucose level. Overall the Mean Absolute
Relative Difference was 13.9% for the comparison with BG reference. The Median Absolute Relative
Difference shows that half of the time the System was within 11.1% of the BG reference.
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