Correlation between the level of arsenic measured in cord blood and maternal blood.

<p>The Pearson correlation coefficient r between the natural logarithm (ln-transformed) of the As values in cord blood (horizontal axis) and maternal blood (vertical axis) equals 0.82 (N = 177, p-value <0.0001). The vertical and horizontal dotted line correspond to the geometric mean of cord blood and maternal blood As levels respectively. For downstream analysis, the level of As in cord blood was categorized, i.e. ‘low As’ (filled squares): samples for which As level smaller than geometric mean minus standard deviation; ‘high As’ (filled triangles): higher than geometric mean plus standard deviation; ‘median As’ (open circles): all samples in between.