Table 2.

The main elements for the assessment of glycaemic variability in the ambulatory glucose profile section

Description	Definition
Median line (50th percentile)	The dark-blue median line traces the 50th percentile value across the 24 h period. 50% of all glucose readings recorded will be above this line and 50% will be below Recommended image: the median line should be as flat as possible over the entire 24 h and within the target glucose range
The interquartile range (IQR); the 25th–75th percentile band)	This is the range within which 50% of all glucose readings fall—25% above and 25% below the median. A wide IQR band is the result of high glucose variability. When the 25th percentile curve falls below the target range, this indicates frequent hypoglycaemia. When the 75th percentile curve extends above the target range, this indicates frequent hyperglycaemia Recommended image: a narrow IQR blue band that is within the target glucose range
The 5th–95th percentile band	This is the range within which 90% of all glucose readings fall. A wide band is the result of high variability in glucose. When the 5th percentile curve falls below the target range, this indicates a higher incidence of hypoglycaemia. When the 95th percentile curve rises above the target range, this indicates a higher incidence of hyperglycaemia Recommended image: a narrow, lighter-coloured 5th–95th percentile band that is as close as possible to the target glucose range