Dexcom SEVEN User Manual page 121

The percentage of Seven System results in the above graph are presented in Table 6
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 concentration.
table 7. Clarke error Grid Analysis, Stratified by ySi Glucose Concentrations
Glucose Range Total YSI – Seven
(mg/dl) System Pairs
40-75
76-180
181-300
301-400
Overall
*N/A means that the Clarke Error Grid does not consider the possibility of these zones in that concentration range.
The Continuous Error Grid was also used to determine if the Seven System results are
"clinically accurate". The Continuous Error Grid looks at how closely the Seven System
readings match to the YSI Analyzer and also how closely the Seven System glucose rate of
change (how fast the glucose rises or falls) compared to the actual blood glucose rate of
change measured by the YSI. The data is evaluated in 3 zones: clinically accurate readings,
benign errors, and clinically inaccurate readings. See the table below for the Seven System
accuracy by glucose range. There were 2,173 paired points evaluated.
A %
149 69%
1144 68%
850 73%
175 71%
2318 70%
B % c %
15% 0%
31% 1%
25% 1%
29% N/A*
27% 1%
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™
D % E %
15% 1%
N/A* N/A*
1 % 0%
0% 0%
2% 0%