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Accuracy of Guardian RT readings

In this study, YSI measurements (taken every half hour) were paired with the corresponding Guardian RT

reading (taken every five minutes). Pairing was done by selecting the Guardian RT value closest in time to

the YSI test result. Agreement was analyzed by comparing paired glucose measurements.

Agreement between the matched pair was estimated by evaluating the difference between the Guardian RT

reading and the YSI measurement. The difference between them was calculated as a percentage of the YSI

(Mean Absolute Percent Difference). The bias was also calculated, and it is defined as the overall difference

between the Guardian RT glucose values and the YSI values. The paired glucose measurements are

summarized below.

Number of Paired Glucose Measurements

3941

Mean Absolute Percent Difference (± SD) 19.7 ± 18.4%

Bias -0.8 mmol/L (-15.0 mg/dL)

The accuracy of the Guardian RT was also evaluated by calculating the percentage of Guardian RT readings

within 20 percent and within 30 percent of the YSI reading (or within 1.1 mmol/L (20 mg/dL) in the low

glucose range). Results are shown below.

Plasma Glucose

Range (mg/dl)

Plasma Glucose

Range (mmol/l)

Number of Paired

Readings

Percent Within

20%

Percent Within

30%

Overall 3941 62% 79%

40-80

2.2-4.4 356 68% 68%

>80-120 >4.4-6.7 769 60% 77%

>120-240 >6.7-13.3 2362 62% 81%

>240 >13.3 454 61% 82%

a. For the Low glucose range, 2.2-4.4 mmol/L (40-80 mg/dL), the value shown is the percent within

1.1 mmol/L (20 mg/dL).

Sensor accuracy

209

ಘAppendix A

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