Clinical Sample Detection and Comparison. We used BlandAltman difference plot analyses to evaluate the correlation between the proposed method (FAAS) and a reference method (ICP-OES) on clinical sample detection (Figure 1) (29). The
Bland-Altman difference plot analysis for Cu showed a mean (SD) difference (FAAS minus ICP-OES) of 0.4 (0.7) mg L-1, and the ranges for the limits of agreement (from d - 1.96S to d þ 1.96S; from -15.8 to 15.1 μg L-1) were sufficiently narrow.