Figure 3.

Relationship between airborne bacterial communities and factors. (a) Spearman’s correlation matrix of the microbial diversity (Chao1 index and Shannon index) is associated with different factors. Note: The correlations for the Shannon index are weak (correlation coefficient |r| < 0.3) but have the same trend as that of the Chao1 index. (b) Pairwise Spearman’s correlation matrix of pathogenic genera with factors. Pathogenic genera could be divided into four clusters according to their correlations with factors. Only associations with Spearman’s correlation coefficients |r| ≥ 0.3 and adjust p ≤ 0.05 were retained. Asterisks denote correlation test results (*: adjust p ≤ 0.05).