Distribution of percent densities among the 695 study subjects of the DIOS-Study 2006–2008 according to age group. Box width varies with age group size. Whiskers indicate observations between the lower and upper fence [i.e. 1.5*interquartile range (IQR) below 25th percentile and 1.5*IQR above 75th percentile]. Plus symbols indicate observations outside the fences. Filled squares indicate mean percent density values. Horizontal lines within the boxes indicate the median percent density values.
Trocchi et al. BMC Cancer 2012 12:554 doi:10.1186/1471-2407-12-554