Freestyle Libre - Using Reminders

Table 4: Number and Percent of Results within BG Values*
CGM Glucose
Level
(mg/dL)
Number of
CGM-Reference
Pairs
Within
±15% /
±15mg/dL
Within
±20% /
±20mg/dL
Within
±30% /
±30mg/dL
Within
±40% /
±40mg/dL
Outside
±40% /
±40mg/dL
Overall 3680 72.8 84.3 95.0 98.0 2.0
40-50 23 47.8 73.9 87.0 95.7 4.3
51-80 288 65.6 77.1 89.6 97.6 2.4
81-180 1722 71.7 82.9 94.7 97.4 2.6
181-300 1193 75.0 87.3 96.2 98.4 1.6
301-400 362 76.8 87.8 97.2 99.2 0.8
401-500 92 78.3 85.9 95.7 98.9 1.1
* Comparison to BG was performed using the FreeStyle Libre Reader’s built-in blood glucose meter. Dierent
performance may be expected when compared to other models of blood glucose meters.
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 glucose 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 12.1% for the
comparison with BG value. The Median Absolute Relative Dierence shows that half of the time the
System was within 9.4% 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
3680 9.4% 12.1%
* Comparison to BG was performed using the FreeStyle Libre 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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