Fig. 4From: Bacterial community assemblages in classroom floor dust of 50 public schools in a large city: characterization using 16S rRNA sequences and associations with environmental factorsCorrelations among bacterial diversity index and environmental parameters. The values on the upper diagonal of the correlation matrix are Pearson correlation coefficients with the significance level for the bivariate scatter plots on the lower diagonal. The distribution of each variable is shown on the diagonal. FCI, facility condition assessment index; P values: **P value ≤ 0.05, *0.05 < P value ≤ 0.1Back to article page