Freestyle Libre 14 day - Page 117

Overall Accuracy against BG values
Accuracy was measured by comparing the absolute relative dierence between the System and BG
values. The absolute relative dierence measures the level of disagreement between the System
and the BG value, but does not tell you whether the System glucose value was, on average, higher
or lower than the BG value. The Mean Absolute Relative Dierence gives an indication of the average
percent disagreement between the CGM and the BG value. Table 5 shows the overall absolute
dierence measure. Overall the Mean Absolute Relative Dierence was 11.4% for the comparison
with BG value. The Median Absolute Relative Dierence shows that half of the time the System was
within 9.1% of the BG value.
Table 5: Dierence Measures with BG Value *
Number of
CGM-Reference Pairs
Median Absolute Relative
Dierence (%)
Mean Absolute Relative
Dierence (%)
9234 9.1 11.4
* Comparison to BG was performed using the Reader’s built-in blood glucose meter. Dierent performance may
be expected when compared to other models of blood glucose meters.
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