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

Table 3.

Continuous Glucose Monitoring System Accuracy and Stability by Clinic Visit

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]
Day 1 1737 77.0 87.3 96.1 98.4 10.5 (9.4–11.6)
Day 30 5385 89.0 94.4 98.1 99.2 8.0 (6.8–8.8)
Day 60 5016 87.9 95.1 98.8 99.7 8.2 (7.3–8.9)
Day 90 4515 82.7 92.5 97.9 99.6 9.6 (8.6–10.5)

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.