Spearman’s rank correlation between occupant intensity (Nd) and combined relative abundance of selected group of genera and Shannon diversity index values.

The left frames showcase the correlations of bacteria and the right frames are for fungi. The symbol ρ indicates the Spearman’s rank correlation coefficient and * denotes statistical significance for the correlation at p < 0.05 with n = 5. a Correlation between occupant intensity and the group of human-related bacterial genera based on Qian et al. [9] and Hospodsky et al. [10]. b Correlation between occupant intensity and the group of bacterial genera commonly found in occupied spaces based on Kembel et al. [32]. c Correlation between occupant intensity and the group of human related fungal genera based on Yamamoto et al. [36].