Table 1.

Spearman correlation analysis between occupancy density and the taxa at class level and genus level in the dust and filter.

		Dust			Filter
		rho	p	Mean	rho	p	Mean
				abundance			abundance
Class	Bacteroidia	—	—	—	0.79	0.002**	0.024
	Ardenticatenia	—	—	—	0.61	0.036*	0.002
	Coriobacteriia	0.62	0.032*	0.003	—	—	—
	Actinobacteria	−0.64	0.025*	0.064	—	—	—
Genus	Alloprevotella	0.62	0.03*	0.022	0.64	0.025*	0.0019
	Klebsiella	0.66	0.02*	0.006	0.64	0.026*	0.0001
	Lentzea	−0.67	0.018*	0.001	—	—	—

The taxa with mean abundance greater than 0.001 in either group were selected for correlation analysis. Spearman correlation analysis was carried out in stats packages in R environment.