Fig. 4From: Prospective comparison of capillary and venous brain biomarker S100B: capillary samples have large inter-sample variation and poor correlation with venous samplesBland-Altman plot capillary 1 versus capillary 2 S100B. Sixty-one matched samples. Regression line: intercept = − 0.002 (95% CI − 0.06 to 0.05). Slope = − 0.08 (− 0.34–0.18). R2 = 0.07Back to article page