The continuous overall net glycemic action (CONGA) index is an indicator of within-day glucose variability. After the first n number of hours of observation, the investigators may calculate the difference between current observation and observation in the previous n hours. CONGA is defined as the SD of the recorded differences. The frequently used index CONGA1, CONGA2 and CONGA4, coincide with observations lasting 1, 2, or 4 h and they are, therefore, expressions of glucose variability within these intervals (6).