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. 2018 Mar 1;20(3):197–206. doi: 10.1089/dia.2017.0142

Table 2.

Continuous Glucose Monitoring System Accuracy and Stability Within Yellow Springs Instruments Glucose Ranges

YSI glucose, range (mg/dL) No. of paired CGM system-YSI reference readings Percent within 15/15% reference Percent within 20/20% reference Percent within 30/30% reference Percent within 40/40% reference MARD (%) [95% CI]
Overall 16,653 85.7 93.3 98.1 99.4 8.8 (8.1–9.3)
>40–54 167 83.2 85.6 93.4 96.4 10.7 (7.4–13.3)
55–70 785 86.1 92.9 96.8 98.9 9.0 (8.1–12.0)
71–180 8943 84.8 92.3 97.5 99.2 8.7 (8.2–9.5)
>180 6758 86.9 95.0 99.0 99.8 7.8 (7.3–8.8)

In-clinic accuracy is assessed compared with venous YSI reference measurement. The percentage of system readings within ±15 mg/dL or 15% of YSI reference values (15/15%), ±20 mg/dL or 20% of YSI reference values (20/20%), ±30 mg/dL or 30% of YSI reference values (30/30%), or ±40 mg/dL or 40% of YSI reference values (40/40%) are reported. For YSI ≤70 mg/dL, the differences in mg/dL are included instead of percentage difference (%).

CGM, continuous glucose monitoring; CI, confidence interval; MARD, mean absolute relative difference; YSI, Yellow Springs Instruments.