Fig. (1) The mean serum ferritin level in 17 male participants with ALS (269.9 ng/ml ± 126.4 SD) and 14 healthy controls (164.1 ng/ml ± 142.2 SD) is depicted in boxplot. The horizontal line reflects the median and the box provides the interquartile range from the 25^th to 75^th percentile. Dots represent the observations outside of 10th and 90th percentiles.