Fig. 2From: Microbial differences between dental plaque and historic dental calculus are related to oral biofilm maturation stageMicrobial profile differences between plaque and calculus of differing health status. a Principal component analysis (PCA) clusters plaque and healthy site calculus distinctly. b Distinct species are significantly more abundant in plaque and healthy site calculus. c Microbial profile differences between plaque and all healthy site calculus are sufficient for discrimination of sample types by sparse partial least squares-discriminant analysis (sPLS-DA). Ellipses indicate 95% confidence intervals. d PCA clusters plaque and disease site calculus distinctly. e Distinct species are significantly more abundant in plaque and disease site calculus. f Microbial profile differences between plaque and all disease site calculus are sufficient for discrimination of sample types by sPLS-DA. Ellipses indicate 95% confidence intervalsBack to article page