Table 1—

Summary of accuracy measures over sensor life: sensor vs. SMBG

No. of paired pointsPearson correlation coefficientDifference (mg/dl)*Relative difference (%)ARD (%)
Overall6,3340.8992.3 ± 32.45 (2.0)2.9 ± 21.75 (1.6)15.7 ± 15.34 (11.4)
Day 11,0410.8785.2 ± 35.97 (3.0)4.4 ± 24.71 (2.5)17.9 ± 17.63 (12.9)
Day 21,0680.9208.3 ± 29.91 (7.0)6.4 ± 20.56 (4.8)15.6 ± 14.81 (11.4)
Day 39940.9338.2 ± 28.63 (7.0)6.4 ± 20.39 (5.4)14.8 ± 15.44 (10.7)
Day 48770.9042.7 ± 31.19 (2.0)3.6 ± 21.21 (1.4)15.3 ± 15.14 (10.9)
Day 57890.888−1.3 ± 33.22 (0.0)0.7 ± 21.65 (0.0)15.8 ± 14.79 (11.9)
Day 67970.893−5.5 ± 32.51 (−4.0)−1.6 ± 19.33 (−2.6)14.5 ± 12.84 (11.0)
Day 77680.889−6.4 ± 32.18 (−4.0)−2.0 ± 22.10 (−2.8)15.7 ± 15.62 (11.5)
  • Data are means ± SD (median).

  • *

    * Calculated as (sensor − SMBG), where for each paired point sensor indicates time-matched continuously measured glucose value.

  • Calculated as [(sensor − SMBG)/SMBG].

  • Calculated as the absolute value of [(sensor − SMBG)/SMBG]. Day is defined from the time of sensor insertion (in 24-h increments).