Table 3:
Mean absolute relative difference (MARD), 20%/20 agreement rates (AR), i.e., percentages of CGM readings found within ±20% of paired comparator results ≥100 mg/dL and within ±20 mg/dL of paired comparator results <100 mg/dL, and bias (mean relative difference) for a current-generation CGM system.
| Before comparator bias correction | After comparator bias correction | ||||||
|---|---|---|---|---|---|---|---|
| Comparator | n | MARD | 20%/20 AR | Bias | MARD | 20%/20 AR | Bias |
| INT (venous) | 2001 | 9.5% | 93.2% | +3.1% | 10.5% | 91.8% | +6.1% |
| YSI (venous) | 2002 | 11.6% | 88.9% | +8.4% | 10.5% | 91.2% | +6.3% |
| CNX (capillary) | 2005 | 9.7% | 92.4% | -1.1% | 9.7%a | 92.4%a | +1.6%1 |
AR: Agreement rate, MARD: mean absolute relative difference, INT: Cobas Integra 400 plus, YSI: YSI 2300 STAT Plus, CNX: Contour Next
1 CNX results retrospectively corrected based on corrected INT results were used as comparator.