Table 2.

Mean concentrations of airborne microorganisms (bacteria and fungi) at similar wards in the hospitals.

Hospital	Ward	Sample	Mean ± SD (CFU/m3 of air)∗	Std error mean
Kashani	Operating room	N = 20	64.5 ± 6.75	1.50
Hajar		N = 20	43.75 ± 20.32	4.55
Kashani	ICU	N = 20	57 ± 19.32	4.32
Hajar		N = 20	48.75 ± 21.27	4.75
Kashani	Female surgery	N = 20	72.5 ± 20.03	4.48
Hajar		N = 20	62.75 ± 9.33	2.08

^∗A level of significance at p < 0.05.