. 2013 Nov 17;186(4):2111–2120. doi: 10.1007/s10661-013-3521-8

Table 2.

Seasonal distributions of culturable bioaerosols and endotoxin levels in indoor and outdoor air of apartments (n = 25)

Bioaerosols	Spring		Summer		Autumn		Winter		F value
Bioaerosols	I	O	I	O	I	O	I	O	I	O
Total suspended bacteria (CFU/m³)^a	383	174	673	139	547	195	280	76	10.134*	5.964*
Gram-positive bacteria (CFU/m³)^a	251	50	378	36	335	46	106	26	12.528*	3.660*
Staphylococcus (CFU/m³)^a	154	37	230	31	143	35	52	22	7.268*	1.169
S. aureus (CFU/m³)^a	45	11	45	7	27	9	27	9	7.406*	1.739
Methicillin-resistant S. aureus (CFU/m³)^b	2	1	11	3	9	2	6	2	–	–
Gram-negative bacteria (CFU/m³)^b	8	3	3	5	5	4	0	0	–	–
Coliform (CFU/m³)^b	0	0	0	0	0	0	0	0	–	–
Fungi (CFU/m³)^a	180	210	219	203	177	231	96	76	11.981*	17.194*
Endotoxin (EU/m³)^a	0.260	0.235	0.214	0.127	0.470	0.419	0.209	0.149	6.106*	8.712*

CFU colony forming unit, EU endotoxin unit, I indoor air, O outdoor air

*p < 0.05 by ANOVA test

^aGeometric mean

^bArithmetic mean