Table 3.
GW2B Accuracy Summary Statistics by Various Factors
| # Paired Data Points | Relative Absolute Difference (median) | ISO criteria met* (percentage) | P-values† | |
|---|---|---|---|---|
| Overall | 3,672 | 16% | 60% | |
| Subject Age (years) | 0.97/0.91 | |||
| 1 – <7 | 896 | 17% | 59% | |
| 7 – <12 | 1,178 | 15% | 61% | |
| 12 – <18 | 1,598 | 16% | 60% | |
| Gender | 0.99/0.70 | |||
| Female | 1,815 | 16% | 60% | |
| Male | 1,857 | 16% | 61% | |
| Body Mass Index | 0.21/0.27 | |||
| ≤50th percentile | 853 | 15% | 64% | |
| >50th percentile | 2,819 | 16% | 59% | |
| Time of Day‡ | 0.56/0.49 | |||
| Daytime (6:30AM – 10:30PM) | 1,123 | 15% | 63% | |
| Nighttime (11:00PM – 6:00AM) | 1,530 | 16% | 61% | |
| Sensor Age (hours) | 0.002/0.006 | |||
| 0 – <6 | 1,316 | 15% | 63% | |
| 6 – <10 | 1,142 | 15% | 64% | |
| ≥ 10 | 1,214 | 19% | 54% | |
| GW2B Location|| | 0.26/0.22 § | |||
| Lower Arm | 2,226 | 16% | 59% | |
| Inner | 1,417 | 15% | 61% | |
| Outer | 809 | 18% | 56% | |
| Upper Arm | 1,284 | 15% | 63% | |
| Inner | 268 | 17% | 58% | |
| Outer | 1,016 | 15% | 65% | |
| Serum Glucose Level (mg/dL) | <0.001/< 0.001 | |||
| ≤70 | 334 | 38% | 32% | |
| 71–120 | 926 | 18% | 55% | |
| 121–180 | 963 | 14% | 66% | |
| 181–240 | 776 | 14% | 66% | |
| >240 | 673 | 13% | 67% | |
| Hypoglycemia Test | 482 | 20% | 52% | 0.007/0.02 |
| Hyperglycemia Test | 417 | 15% | 66% |
*
ISO criteria: for reference glucose value ≤75 mg/dL, GW2B value within ±15 mg/dL and for reference glucose value >75 mg/dL. GW2B value within ±20%.
†
The first P-value is for RAD and the second P-value is for ISO criteria met.
‡
Includes only hourly and half hour reference glucose values.
§
Comparing lower arm vs. upper arm.
||
162 pairs from sensor pads placed on leg not included.