Table 6: Difference Measures by BG Reference Levels*
BG Reference
Reference Glucose
Level (mg/dL)
Number of GM-
Reference Pairs
Median Absolute
Relative Difference (%)
Mean Absolute Relative
Difference (%)
Overall
11918
11.1
13.9
40-50**
152
13.5
19.1
51-80**
841
10.0
12.6
81-180
6397
10.9
13.5
181-300
3719
10.9
12.9
301-400
695
9.1
11.3
401-500
114
7.1
9.2
* Comparison to BG was performed using the FreeStyle Precision blood glucose meter. Different performance may be expected when compared to
other models of blood glucose meters.
** For reference values ≤ 80 mg/dL, the mean and median absolute differences (mg/dL) are presented instead of mean and median absolute relative
differences (%).
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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