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Clinical measures of bleeding on probing (BOP) and mouth mean probing pocket depth (PPD) in nonhuman primates. The animals were organized into young/adolescent (Y/ADO) and adult/aged (AD/AG) groups. The points denote group means for Y/ADO animals (n = 18) and AD/AG animals (n = 18), and the vertical brackets depict 1 standard deviation (SD). The asterisks denote a significant difference between groups at a time point (baseline and 0.5, 1, 3, and 5 months) at a P value of <0.05.
