Dexcom G5 Mobile System User Guide
328Technical Information
Relative to SMBG (Pediatric Study)
Performance was also estimated by calculating the percentage of system readings within various
percentages of the SMBG values at each day of the sensor wear period (Table 8-C). The average and
median of the absolute percent differences are included in the table.
Precision of System Readings
A subset of subjects wore two systems at the same time. This was to look at how similarly two
systems function on the same subject (sensor precision). Precision was evaluated by comparing the
glucose readings from the two systems worn on the same subject at the same time.
In the Original Adult Study, 36 subjects wore two systems. Results showed that system readings
from the two sensors generally agreed with each other within 9% (absolute percent difference) with
a 7% coefficient of variation. In the Original Pediatric Study, all subjects wore two systems. Results
showed that system readings from the two sensors generally agreed with each other within 10%
(absolute percent difference) with a 7% coefficient of variation. Only one system was worn in the
Software 505 Adult and Software 505 Pediatric Studies, so precision data was not collected.
Sensor Life
Sensors may be worn for up to 7 days (168 hours). To estimate how long a sensor will work over
7 days, all sensors worn were evaluated to determine how many days/hours of readings each
sensor provided.
In the Original Adult Study, 108 sensors were evaluated. Ninety-four percent (94%) of the sensors
lasted until Day 7 (145-168 hours). There were 6 (6%) sensors that ended early, four of which lasted
more than 3 days.
In the Software 505 Adult Study, 51 sensors were evaluated. Ninety-eight percent (98%) of the
sensors lasted until Day 7 (145-168 hours). There was 1 (2%) sensor that ended early, which lasted
until day 5 of the sensor wear.
In the Original Pediatric Study, 351 sensors were evaluated. Eighty-five percent (85%) of the sensors
lasted until Day 7 (145-168 hours).
In the Software 505 Pediatric Study, 77 sensors were evaluated. Ninety-four percent (94%) of the
sensors lasted until Day 7 (145-168 hours).
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