Relative and contextual contribution of different sources to the composition and abundance of indoor air bacteria in residences

Table 1 Effect of the household characteristics on the abundance and diversity of bacteria in air

	Number of residents	Activity^a	Cooking^b	Vacuum cleaning^c	Number of pets	Natural ventilation^d	Vegetation^e
Bacterial abundance	0.45	0.40	0.36	0.23	0.33	0.56	−0.05
Sink prediction
Bathtub tiles	0.14	0.03	−0.32	0.08	−0.13	0.33	−0.03
Carpet	−0.02	0.04	0.21	0.06	0.27	0.08	0.09
Counter top	−0.31	−0.29	−0.17	0.06	0.31	0.07	0.10
Doorstep	−0.08	−0.18	0.05	0.05	−0.12	0.29	0.01
Floor	0.04	−0.14	−0.21	0.52	0.19	0.09	0.46
Refrigerator	−0.11	0.05	−0.04	0.07	−0.28	−0.10	0.00
Outdoor air	0.10	0.33	0.11	0.01	0.06	−0.28	−0.06
Pet	0.14	−0.02	0.21	0.46	0.33	−0.22	0.06
Saliva	0.19	−0.11	−0.04	−0.04	−0.08	−0.39	−0.31
Showerhead	−0.03	−0.08	−0.24	0.21	−0.25	−0.25	−0.34
Skin	0.47	−0.16	0.21	−0.22	−0.18	−0.18	−0.01
Tap water	−0.15	−0.30	−0.28	−0.02	−0.15	−0.40	−0.36
Toilet	0.08	0.24	−0.02	−0.26	−0.15	0.09	0.26

Values represent the Spearman’s rank correlation coefficient (ρ) between bacterial abundance in indoor air and sink prediction in indoor air for various source environments and household characteristics. Correlations in italics are significant at a p value <0.05
^aDaily hours spent indoors
^bTimes per week
^cTimes per month
^dDaily hours
^ePercentage of coverage

ISSN: 2049-2618