MARD – Mean Absolute Relative Difference
- Mean Absolute Relative Difference, is a measurement of on average how far away the sensor reading is from the blood glucose reading, this is regardless if the reading is above or below the blood glucose value.
- A large MARD indicates large discrepancies between the sensor result and blood glucose result therefore a smaller MARD is more desirable for a Continuous Glucose Monitor.
GlucoRx AiDEX™ Accuracy Study (Linong Ji, 2021)
The performance of GlucoRx AiDEX™ was evaluated alongside the current market leader for Flash Monitoring, the FreeStyle Libre. This was a multicenter clinical evaluation study conducted across 4 sites, data was collected from 120 participants, 120 patients wore 4 AiDEX™ sensors simultaneously, 40 of the 120 also wore the FreeStyle libre sensors. These participants were both in both inpatient and outpatient aged 14+.
The results from both systems were plotted onto a CEG and a Clarke Error Grid Analysis Chart. The results show GlucoRx AiDEX™ has an overall system accuracy of 98.69% and overall MARD result of 9.08% when compared to the venous blood glucose reference.
While both systems had nearly 100% combined Zone A & B, the number was significantly lower for the FreeStyle Libre. We can see here a large proportion of the Abbott Freestyle Sensor readings have a negative bias. Although still accurate, it demonstrates the benefit of GlucoRx AiDEX™ having a custom calibration function.