Fig. 4.

Dominant bacterial genera are potentially associated with the presence of pigment (a), caries (b), and mixed caries/pigment (c) in the plaque-unique community type A. The relative abundance of the most abundant genera in the samples assigned to each of the sample types (the boxes represent the IQR, and the error bars represent the 95 % confidence interval; n (HP) = 11; n (CP) = 10; n (PP) = 16; n (CPP) = 8). Statistical significance was evaluated using the Kruskal-Wallis one-way analysis of variance on ranks with adjusted P-values: *** < 0.001, ** < 0.01, and * < 0.05. The pairwise positive correlations marked by double-arrow lines were calculated using the Spearman rank-order correlation with the correlation coefficient R and the P-values