Fig. 2.

There was a significant correlation between age and TPPMlog₁₀ (r ² linear = 0.227) (a). A significant graded main effect of age group was found where older two age groups were significantly different from the two younger groups (p < 0.001–0.016) and from each other (<0.001). No main effect of sex (p = 0.953) or age group × sex interaction (p = 0.923) was found (b)