Agreement with CGM Glucose Levels
Agreement between CGM and venous blood was characterized by using paired CGM and Yellow
Springs Instrument measurements (YSI). The accuracy of CGM versus YSI reference was assessed
by calculating the percentage of System readings that were within 15%, 20%, 30% and 40% for
reference values 80 mg/dL and above, and 15 mg/dL, 20 mg/dL, 30 mg/dL and 40 mg/dL for values
below 80 mg/dL. The results are presented in Table 1 for YSI reference. Overall 90.9% of results
were within ±20 mg/dL / 20% of YSI reference.
Table 1: Number and Percent of Results within YSI Reference
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 9725 83.0 90.9 97.3 99.1 0.9
40-50 40 52.5 60.0 80.0 85.0 15.0
51-80 741 58.2 70.9 87.9 94.6 5.4
81-180 6112 82.2 90.9 97.5 99.4 0.6
181-300 2513 91.7 96.9 99.4 99.8 0.2
301-400 291 89.0 95.2 99.7 99.7 0.3
401-500 28 100.0 100.0 100.0 100.0 0.0
108
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