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. 2019 Oct 11;14(10):e0216851. doi: 10.1371/journal.pone.0216851

Table 1. Summary measures of glycemia.

CGM Variable Definition
percent_cgm_wear The number of sensor readings as a percentage of the number of potential readings (given time worn).
average_sensor Mean of all sensor glucose values
estimated_a1c Estimated HbA1c based on the equation: (46.7 + average glucose in mg/dL) / 28.7 [1]
gmi Glucose management indicator based on the equation: 3.31 + (0.02392 × average glucose in mg/dL)7
q1_sensor First quartile sensor glucose value
median_sensor Median sensor glucose value
q3_sensor Third quartile sensor glucose value
standard_deviation Standard deviation of all sensor glucose values
cv Coefficient of variation of all sensor glucose values (SD/mean)
min_sensor Minimum of all sensor glucose values
max_sensor Maximum of all sensor glucose values
excursions_over_*** The number of local glucose peaks with an amplitude greater than *** mg/dL
min_spent_over_*** The total length of time that sensor glucose was at or above *** mg/dL
percent_time_over_*** Minutes spent above *** mg/dL, as a percentage of the total time CGM was worn
avg_excur_over_***_per_day The number of glucose peaks above *** mg/dL averaged per 24-hour period of CGM wear
min_spent_under_** The total length of time that sensor glucose was at or below ** mg/dL
percent_time_under_** Minutes spent below ** mg/dL, as a percentage of the total time CGM was worn
min_spent_70_180 Minutes spent in the range 70–180 mg/dL (inclusive)
percent_time_70_180 Minutes spent in the range 70–180 mg/dL (inclusive), as a percentage of the total time CGM was worn
daytime_*** *** of all sensor glucose values during specified daytime hours
nighttime_*** *** of all sensor glucose values during specified nighttime hours
auc Approximate area under the sensor glucose curve, calculated using the trapezoidal rule
r_mage MAGE calculated according to Baghurst’s algorithm
j_index Calculated based on the equation: 0.324 × (average glucose in mg/dL + standard deviation of glucose levels)^211
conga Continuous overall net glycemic action, default n = 1 hour11
modd Mean of daily differences
lbgi Low blood glucose index
hbgi High blood glucose index