Table 1

Sensor glucose values and glucose variability by age group and time of day

AllAge groupTime of day
8–<1515–<2525–<45≥45DaytimeNighttime
n7420172017
A1C (%)5.3 ± 0.35.3 ± 0.25.2 ± 0.25.2 ± 0.35.5 ± 0.3
Sensor glucose
Overall*98 ± 10103 ± 1197 ± 796 ± 1295 ± 7
Daytime99 ± 10103 ± 1098 ± 797 ± 1297 ± 6
Nighttime95 ± 13101 ± 1597 ± 1191 ± 1289 ± 11
Peak sensor glucose§
    Daytime131134135125128
    Nighttime109111111104103
Nadir sensor glucose§
    Daytime7374717579
    Nighttime8084807778
Distribution of sensor glucose levels
    71–120 mg/dl91.0%85.1%87.9%91.4%93.7%90.4%90.3%
    ≤70 mg/dl1.7%1.8%0.6%2.9%1.6%1.1%2.2%
    ≤60 mg/dl0.2%0.2%0.0%0.2%0.1%0.0%0.0%
    >120 mg/dl5.6%8.2%8.3%4.2%4.4%5.9%1.1%
    >140 mg/dl0.4%1.3%0.3%0.3%0.0%0.5%0.0%
Overall glucose variability
    SD (mg/dl)13.716.413.712.612.413.510.9
    MARC (mg/dl/min)0.340.360.340.320.330.370.26
    Coefficient of variation (%)14161414131412
    MAGE (mg/dl)27.728.128.325.626.928.015.8
  • Data are means ± SD and medians.

  • *P = 0.009 for the association of mean glucose with age, adjusting for device type.

  • P = 0.04 for the association of mean glucose with age, adjusting for device type.

  • P < 0.001 for the association of mean glucose with age, adjusting for device type.

  • §The calculation of peak and nadir glucose was restricted to days with ≥12 h and nights with ≥4 h of glucose data.

  • P < 0.001 for the association of glucose variability with time of day, adjusting for device type and mean glucose.

  • ¶Coefficient of variation = SD/mean glucose. MARC, mean absolute rate of change; MAGE, mean amplitude of glycemic excursions.