
The following figure is a correlation plot of Guardian RT readings versus readings from the reference method,
the blood glucose meter. It is overlaid with the Clarke Error Grid. The total number of paired data points is
2599.
Meter BG (mg/dL)
Sensor BG (mg/dL)
A (1733, 66.7%)
B (665, 25.6%)
C (7, 0.3%)
D (193, 7.4%)
E (1, 0.0%)
The percent of Guardian RT readings in the above graph are presented in the table below according to the
percentage of points falling within each zone (A-E). Results are further broken down (stratified) according
to the range of glucose concentrations.
Sensor accuracy
225
ಘAppendix A
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