Fig. 1From: Old age and other factors associated with salivary microbiome variationPhylogenetic Diversity of saliva from young, middle, and old aged groups. Box plot of: a comparison of richness based on the Chao1 indices shows middle and old age groups show lower diversity than the young group, p < 9.69 × 10−13 and p < 6.52 × 10−05, respectively; b comparison of Shannon Diversity reveals the old age group is less diverse than young group p < 1.5 × 10−05 and trends that way for middle age versus young, p < 0.0701Back to article page