Table 2. Characteristics of livestock operations and worker exposures, North Carolina, 2011.

		ILO		AFLO		Chi-square
		N = 80	%	N = 92	%	value (df)
Direct contact with livestock		77	96.3	92	100.0	3.51 (1)
Direct contact with pigs a		59	73.8	62	67.4	1.76 (1)
Direct contact with poultry a		19	23.8	65	70.7	35.44 (1)
Direct contact with other animals		2	2.5	73	79.3	100.03 (1)
Number of pigs in direct contact with/day b						108.16 (4)
None		21	26.3	30	32.6
1–249		1	1.3	53	57.6
250–499		1	1.3	5	5.4
500–999		3	3.8	4	4.3
≥1000		54	67.5	0	0
Number of poultry in direct contact with/day c						76.21 (4)
None		61	76.3	27	29.3
1–249		0	0	52	56.5
250–499		0	0	5	5.4
500–999		0	0	1	1.1
≥1000		19	23.8	7	7.6
Hours/week worked in direct contact with livestock						132.02 (3)
None		3	3.8	0	0
1–20 hours		5	6.3	81	88.0
21–40 hours		10	12.5	11	12.0
>40 hoursd		62	77.5	0	0

ILO = industrial livestock operation.

AFLO = antibiotic-free livestock operation.

^aCategories are not exclusive.

^bRestricted to workers reporting direct contact with pigs.

^cRestricted to workers reporting direct contact with poultry.

^dThe maximum number of hours/week worked in direct contact with livestock was 73.5 and 35 hours for ILO and AFLO workers, respectively.