Box-and-whisker plots of sperm DNA fragmentation for different genotypes. The boxes represent the 25th and 75th percentiles; whiskers are lines extending from each end of the box covering the extent of the data on 1.5 × inter-quartile range. The median value is denoted as the line that bisects the boxes. Circles and asterisks represent the outlier values. Significant differences were measured by multiple linear regression.
Ji et al. BMC Medicine 2012 10:49 doi:10.1186/1741-7015-10-49