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. 2019 Jun 19;14(1):135–150. doi: 10.1177/1932296819855670

Table 1.

Factors That Influence the Assessment of the MARD.

CGM system-inherent factors (intrinsic performance of the system)
• Calibration
• Performance of the CGM sensor over time
• Sensor to sensor variation
• Algorithms and smoothing filters implemented in the CGM systems
Not CGM system-inherent factors
• Insertion factors (competency of sensor insertion, body site, movement)
• Physiological time delay between CGM and BG measurements
• Range and distribution of the paired glucose values
• Rate of change in glycemia
• Study design / study population
• Implementation of the study design (controlled vs uncontrolled environment, time of day, day 1 vs day 2-X, dynamic variation in glucose concentration, number of measurements, synchronization of CGM, and comparison method)
• Direction of the deviations from the comparison method