Dexcom SEVEN User Manual page 119

CLARKE ERROR GRID ANALYSES
The Clarke Error Grid was used to determine if Seven System results are "clinically
accurate". The Clarke Error Grid divides a correlation plot into 5 zones, which are
described in the table below.
table 6. Clarke error Grid Description
Zone Description
A Clinically Accurate, would lead to correct treatment decisions
B would lead to benign decisions or no treatment
C would lead to overcorrection of normal glucose levels
D would lead to failure to be aware of and treatment of high or low glucose levels
E would lead to inaccurate and "dangerous" treatment decisions
Results in zones A and B are considered clinically acceptable, while results in zones C, D,
and E are potentially dangerous. They may result in clinically significant errors. The Clarke
Error Grid zones are labeled on a correlation plot in Figure 1. Each YSI result (on the
horizontal axis) is matched up with its corresponding Seven System result (on the vertical
axis). A point is recorded where the two readings intersect. These results are based on
2,318 paired data points recorded.
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