Table 3.

Particle load with and without LAF application depending on the measurement place

	n	0.3 µm	0.5 µm	1 µm	2 µm	5 µm	10 µm
LAF
Operation column (central LAF area)	18	8068 ± 10,197	3298 ± 4464	1845 ± 2991	1207 ± 2229	452 ± 937	196 ± 457
Anaesthesia device (marginal LAF area)	18	3,991,490 ± 16,915,423	264,144 ± 1,111,856	42,138 ± 174,027	12,466 ± 49,523	1217 ± 3747	442 ± 1303
Surgical image amplifier (outside LAF area)	18	15,433 628 ± 54,381,711	1,443, 944 ± 4,427,504	127,012 ± 361,229	24,234 ± 63,219	1247 ± 2202	354 ± 469
Factor		1913	438	69	20	2.8	1.8
p (Friedman)		p < 0.01	p < 0.01	p < 0.01	p < 0.01	p = 0.174	p = 0.57
Non- LAF
Operation column (central LAF area)	18	28,558,716 ± 18,156,222	2,853,808 ± 1,844,888	185,061 ± 128,992	47,753 ± 46,313	9089 ± 9160	3828 ± 3893
Anaesthesia device (marginal LAF area)	18	25,956,930 ± 14,670,502	2,735,748 ± 1,774,967	170,770 ± 116,376	43,914 ± 48,841	8147 ± 11,342	3534 ± 5596
Surgical image amplifier (outside LAF area)	18	47 084 000 ± 71 139 621	3 519 101 ± 3 840 879	241 834 ± 366 363	51,453 ± 90,657	6419 ± 8026	2434 ± 2612
Factor		1.6	1.2	1.3	1.1	0.7	0.6
p (Friedman)		p < 0.01	p < 0.01	p < 0.01	p < 0.01	p < 0.01	p < 0.01

LAF laminar air flow