SEVEN PLUS User’s Guide | 109
Agreement
Agreement between the SEVEN PLUS and glucose levels is characterized using paired SEVEN
PLUS and YSI results. The SEVEN PLUS and YSI readings were compared by pairing the YSI blood
glucose reading to a SEVEN PLUS glucose reading that occurred approximately 5 minutes after the
YSI reading was collected.
The agreement of the SEVEN PLUS to blood glucose levels was assessed by calculating the
percentage of SEVEN PLUS readings that were within 20%, 30%, and greater than 40% of
the YSI readings. For readings less than or equal to 80 mg/dL the difference in mg/dL between
the two glucose readings was calculated. For readings greater than 80 mg/dL the percent
difference (%) from the YSI reading was calculated. The percentages of total readings within 20
mg/dL or 20%, 30 mg/dL or 30%, or greater than 40 mg/dL or 40% were then calculated. The
total number of data pairs considered in this analysis was 1,827. Results are shown in Table 1.
Table 1. Percentage of SEVEN PLUS Results Falling Within 20, 30, and Greater Than 40
Percent of the Paired YSI Results, at Various Glucose Concentrations
YSI
Readings
(mg/dL)
Number
of Paired
Readings
% of
SEVEN PLUS
Readings
Within 20%*
% of
SEVEN PLUS
Readings
Within 30%*
% of
SEVEN PLUS
Readings Greater
than
40%* of YSI
40-400 1827 76% 90% 5%
40-80 277 73% 87% 6%
81-180 801 74% 89% 5%
181-300 563 81% 93% 3%
301-400 186 75% 95% 2%
* For the 40-80 mg/dL range the absolute difference is presented as the difference in mg/dL
between the
SEVEN PLUS and YSI, rather than the percent.
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