Fig. 2

Scatterplot with linear regression lines, boxplots, and Kaplan–Meier curves in the study patients. A Scatterplot with linear regression lines showing the association between age and mean frontal skull HU values based on the presence of PTBE; B boxplots with dot plots of the mean frontal skull HU values classified by age group according to the presence of PTBE; C overall cumulative hazard of PTBE development; D cumulative hazard of PTBE development according to the hypothetical BMD groups. HU = Hounsfield unit; PTBE = peritumoral brain edema; BMD = bone mineral density