What does the MARD value indicate in CGM readings?

What does the MARD value indicate in CGM readings?

• A. Maximum Absolute Difference
• B. Mean Absolute Difference
• C. Data transmission rate
• D. Not related to accuracy

Answer: (B)

The main idea is how we measure CGM accuracy by looking at how far the sensor readings are from the true values on average. MARD represents the mean of the absolute differences between CGM readings and reference glucose values, but expressed relative to the reference (usually as a percentage). In practice, for each paired reading you compute the absolute difference, divide by the reference value to get a relative error, then average those across all pairs and multiply by 100. A lower MARD means the CGM is closer to the reference on average. So the concept behind the answer is the average size of the disagreement between CGM readings and the true values, scaled to a percent. This is what MARD conveys about accuracy.

The main idea is how we measure CGM accuracy by looking at how far the sensor readings are from the true values on average. MARD represents the mean of the absolute differences between CGM readings and reference glucose values, but expressed relative to the reference (usually as a percentage). In practice, for each paired reading you compute the absolute difference, divide by the reference value to get a relative error, then average those across all pairs and multiply by 100. A lower MARD means the CGM is closer to the reference on average.

So the concept behind the answer is the average size of the disagreement between CGM readings and the true values, scaled to a percent. This is what MARD conveys about accuracy.