Table 5

Concentrations of protease and xylanase in animal feed factories

		Area (A) and personal (P) samples		Samples (n)		Concentration
		Area (A) and personal (P) samples		Samples (n)		Mean	Median	Range
Total dust (mg/m³):
Factory 1	A	35	1.4	0.7	<0.1–7.9
	P	18	2.5	0.9	0.2–30
Factory 2	A	32	2.0	0.4	<0.1–34
	P	19	1.8	1.0	<0.1–6.1
Factory 3	A	34	1.0	0.5	<0.1–7.8
	P	13	1.4	1.0	0.1–4.2
Factory 4	A	15	5.5	2.1	<0.1–35
	P	11	5.6	1.8	<0.1–38

Protease (ng/m³)
Factory 1	A	22	5.8	2.3	<6.6–23
	P	8	170	40	<50–750
Factory 2	A	19	160	2.5	<5.0–2900
	P	11	220	170	<60–1300
Factory 3	A	17	18	3.3	<30–140
	P	6	80	25	<60–360
Factory 4	A	4	13	5.5	<4.0–40
	P	8	360	95	<60–2200

Xylanase (ng/m³)
Factory 1	A	5	6.0	6.3	2.4–8.0
Factory 2	A	4	6.6	6.7	<0.8–13
Factory 3	A	6	3.1	2.2	<0.8–7.7
Factory 4	A	3	5.5	0.4	<0.8–16