Table 4.

Number of livestock and risk of cancer among male farmers in the AHS

Cancer site	Number of livestock	n	RR	95% CI
Lung	None	171	1.0	REF
	<100	115	1.1	0.9	1.4
	100–999	60	0.9	0.7	1.3
	≥1,000	12	0.5	0.3	1.0
				p-trend=0.04
Pancreas	None	32	1.0	REF
	<100	17	0.9	0.5	1.6
	≥100	19	0.7	0.4	0.6
				p-trend=0.32
Colon	None	128	1.0	REF
	<100	73	0.9	0.7	1.2
	100–999	61	0.7	0.5	1.0
	≥1,000	26	0.8	0.5	1.3
				p-trend=0.15
Rectum	None	55	1.0	REF
	<100	34	1.0	0.6	1.5
	100–999	34	0.9	0.5	1.4
	≥1,000	15	1.0	0.5	1.8
				p-trend=0.72
Renal	None	50	1.0	REF
	<100	39	1.2	0.8	1.9
	100–999	31	0.8	0.5	1.3
	≥1,000	10	0.7	0.3	1.4
				p-trend=0.10
Bladder	None	77
	<100	41	0.9	0.6	1.3
	100–999	38	0.9	0.6	1.3
	≥1,000	15	0.9	0.5	1.7
				p-trend=0.66
Brain	None	22	1.0	REF
	<100	9	0.6	0.3	1.4
	100–999	13	0.7	0.3	1.4
	≥1,000	5	0.6	0.2	1.8
				p-trend=0.43
Cutaneous melanoma		54	1.0	REF
	<100	29	0.8	0.5	1.3
	100–999	45	1.2	0.7	1.8
	≥1,000	23	1.4	0.9	2.4
				p-trend=0.09