Figure 1C.

Difference plots of 43 BG systems. Black lines, system accuracy in accordance with DIN EN ISO 15197:2003; dashed lines, system overall accuracy determination according to the current draft revision of ISO 15197. For 9 BG systems with oxygen dependency (as mentioned in the manufacturer’s labeling), data of modified blood samples were excluded from overall system accuracy evaluation. For these 9 systems, the boundaries of concentration categories, including only unprepared blood samples (BG concentration ≥50 and <400 mg/dl) and categories that may include prepared blood samples (BG concentration <50 and ≥400 mg/dl), are marked by dashed perpendicular lines.