Freestyle LIBRE PRO - Page 27

Overall Accuracy against YSI Reference
Accuracy was measured by comparing the absolute relative dierence between the System and
reference YSI glucose values. The absolute relative dierence 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 Dierence gives an indication of the average percent disagreement between the GM and
the reference. Table 4 shows the absolute dierence measures by glucose level. Overall the Mean
Absolute Relative Dierence was 12.3% for the comparison with YSI reference. The Median Absolute
Relative Dierence shows that half of the time the System was within 10.1% of the YSI reference.
Table 4: Dierence Measures by YSI Reference Glucose Levels
YSI Reference
Reference Glucose
Level (mg/dL)
Number of GM-
Reference Pairs
Median Absolute
Relative Dierence (%)
Mean Absolute Relative
Dierence (%)
Overall 12323 10.1 12.3
40-50* 30 14.2 15.8
51-80* 505 12.5 15.5
81-180 7373 10.7 12.9
181-300 4115 8.7 10.1
301-400 286 7.8 8.8
401-500 14 4.2 7.2
* For reference values ≤ 80 mg/dL, the mean and median absolute dierences (mg/dL) are presented instead of
mean and median absolute relative dierences (%).
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