Don’t believe the marketing, MARD is clinical trial statistic, not a device attribute.
From the G7 15 day clinical trial preprint, emphasis mine:
The MARD of 8.0% for the 15-day G7 CGM is the lowest reported MARD in a study designed to meet the FDA’s iCGM criteria.
The clinical trial saw the same thing. High five for being average!
Wear period Matched pairs (n) %15/15 (%) %20/20 (%) %30/30 (%) %40/40 (%) Beginning (days 1–3) 5708 85.5 93.4 98.5 99.8 Early middle (days 4–7) 5507 91.1 96.3 99.8 99.9 Late middle (days 9–12) 5175 91.3 96.3 99.6 100.0 End (days 13–15.5) 3920 86.0 92.3 98.5 99.6 Overall 20,310 88.6 94.7 99.1 99.8 %XX/XX: proportion of CGM values within ±XX% for YSI values ≥100 mg/dL or within ±XX mg/dL for YSI values <100 mg/dL.