Lead, Arsenic, and Cadmium Contamination and Its Impact on Children's Health in La Oroya, Peru
Figure 4
Box plots of drinking water Pb, As, and Cd. Results are shown for the five study sites in parts per billion. The middle panel includes the 10 ppb WHO reference line (see text for discussion). Horizontal lines denote the median value for each site; box heights indicate the quartile limits (25% to 75%); error bars reflect the 95% confidence intervals. Outliers are shown as open circles and asterisks.
