Fig. (2) The mean serum ferritin level in 13 female participants with ALS (183.5 ng/ml ± 186.93 SD) and 16 female controls (71.3 ng/ml ± 60.37 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.