Table 2.
Common CGM Metrics in Persons Without Prediabetes or Diabetes During Day- and Nighttime.
| Difference | ||||
|---|---|---|---|---|
| Variable | Day 06:00-21:59 (n = 60) | Night 22:00-05:59 (n = 60) | Night 22:00-05:59 - Day 06:00-21:59 | P value |
| % time <4.0 mmol/L (72 mg/dL) | 3.71 (2.44; 4.99) 1.91 (0.85; 4.12) | 3.25 (1.51; 5.06) 0.88 (0; 3.13) | −0.46 (–1.99; 1.07) –0.75 (–2.16; 0.49) | .56 |
| % time <3.9 mmol/L (70 mg/dL) | 3.31 (2.15; 4.48) 1.67 (0.69; 3.74) | 2.89 (1.28; 4.56) 0.63 (0; 2.4) | −0.42 (–1.89; 1.04) –0.68 (–1.92; 0.41) | .58 |
| % time <3.0 mmol/L (54 mg/dL) | 0.45 (0.13; 0.77) 0 (0; 0.17) | 0.59 (0.10; 1.13) 0 (0; 0) | 0.14 (–0.39; 0.68) 0 (0; 0) | .67 |
| Mean glucose levels (mmol/L) | 5.81 (5.66; 5.97) 5.77 (5.46; 6.23) | 5.87 (5.67; 6.07) 5.80 (5.35; 6.31) | 0.06 (–0.09; 0.21) 0.07 (–0.37; 0.50) | .45 |
| Mean glucose levels (mg/dL) | 104.7 (101.8; 107.5) 103.8 (98.4; 112.1) | 105.7 (102.1; 109.2) 104.3 (96.3; 113.6) | 1.03 (–1.67; 3.73) 1.29 (–6.56; 9.06) | .45 |
| % time >10.0 mmol/L (180 mg/dL) | 1.38 (0.64; 2.10) 0.35 (0; 1.15) | 1.53 (0.45; 2.65) 0 (0; 0.78) | 0.15 (–0.57; 0.87) 0 (–0.39; 0) | .70 |
| % time >14.0 mmol/L (252 mg/dL) | 0.06 (0.00; 0.13) 0 (0; 0) | 0.04 (0.00; 0.10) 0 (0; 0) | −0.02 (–0.12; 0.08) 0 (0; 0) | .69 |
| % time 3.9 to 10.0 mmol/L (70-180 mg/dL) | 95.3 (94.0; 96.6) 97.4 (94.7; 98.7) | 95.6 (93.6; 97.5) 98.1 (95.3; 99.8) | 0.28 (–1.20; 1.76) 0.53 (–0.89; 2.54) | .71 |
| % time 4.0 to 10.0 mmol/L (72-180 mg/dL) | 94.9 (93.5; 96.3) 97 (94.3; 98.6) | 95.2 (93.2; 97.3) 97.9 (95; 99.7) | 0.31 (–1.23; 1.86) 0.55 (–0.99; 2.57) | .69 |
| % time 3.9-8.0 mmol/L (70 to 144 mg/dL) | 90.4 (88.2; 92.5) 92.6 (87.3; 96.2) | 91.3 (88.7; 93.9) 94.3 (88.1; 98.1) | 0.87 (–0.93; 2.71) 1.05 (–2.83; 5.22) | .34 |
| % time 4.0-8.0 mmol/L (72 to 144 mg/dL) | 90.0 (87.8; 92.2) 92.5 (86.6; 95.9) | 90.9 (88.3; 93.6) 94.3 (87.8; 97.7) | 0.91 (–0.94; 2.78) 0.87 (–2.77; 5.42) | .33 |
| SD glucose levels (mmol/L) | 1.16 (1.06; 1.26) 1.07 (0.91; 1.33) | 1.01 (0.91; 1.11) 0.94 (0.74; 1.17) | −0.15 (–0.23; –0.07) –0.16 (–0.32; 0.05) | <.001 |
| CV (SD/Mean) glucose levels (mmol/L) | 0.20 (0.18; 0.21) 0.19 (0.17; 0.21) | 0.17 (0.16; 0.18) 0.16 (0.14; 0.19) | −0.03 (–0.04; –0.02) –0.02 (–0.05; –0) | <.001 |
| MAGE (mmol/L) | 2.58 (2.37; 2.79) 2.35 (2.02; 2.9) | 2.20 (1.99; 2.41) 2.13 (1.55; 2.56) | −0.38 (–0.56; –0.20) –0.35 (–0.66; 0.01) | <.001 |
Note. For continuous variables, mean (95% CI for mean using the inversion of Fisher’s nonparametric permutation test)/median (Q1; Q3) is presented.
For comparison within groups, the Fisher’s nonparametric permutation test for matched pairs was used.