Figure 1

Box and whisker plots showing the distributions of chromium and cobalt levels for all patients by implant type. For each device type, the top and bottom of the ‘box’ represents the 75th and 25th percentiles of the data. The heavy horizontal line through the box is the median. Circles outside of the ‘whiskers’ represent outliers. The top and bottom of the whiskers are the maximum and minimum values that are not outliers.