Table 1.

Characteristics of imazethapyr-exposed farmers by exposure category in the Agricultural Health Study, 1993-2004^a,^b

Characteristic	Nonexposed		Exposed
	No. (n=28,752)	%	No. (n=20,646)	%
Mean years of follow-up	9.2		9.1
Mean days of imazethpayr use per year (range)			8.8 (3-200)
Mean years of imazethapyr use (range)			4.2 (1-8)
Mean intensity weighted days (range)			260.6 (0.5-78400)
Age at enrollment
<40	9,504	33	8,269	40
40-49	7,639	27	6,158	30
50-59	6,041	21	3,825	19
60+	5,568	19	2,394	11
Gender
Male	27,630	96	20,476	99
Female	1,122	4	170	1
Race
White	27,439	95	20,330	98
Black	751	3	63	<1
Otherc	484	2	217	1
Missing	78	<1	36	<1
State of Residence
Iowa	14,295	50	19,355	94
North Carolina	14,457	50	1,291	6
Applicator Type
Private	26,072	91	18,852	91
Commercial	2,680	9	1,794	9
Smoking History
Never	14,380	50	12,037	58
Former	7,960	28	5,307	26
Current	5,231	18	2,927	14
Missing	1,181	4	375	2
Alcohol Intake in past 12 months
Never	10,946	38	4,137	20
Ever	17,265	60	16,372	79
Missing	541	2	137	1
Education
High School/GED or less	16,261	57	10,583	51
Beyond High School	11,814	41	9,750	47
Missing	677	2	313	2
Family History of Any Cancer
No	16,060	56	11,778	57
Yes	10,580	37	8,098	39
Missing	2,112	7	770	4

^aRestricted to those without previous cancer diagnosis

^bFollow-up through 2004 (range of follow-up years >0-11)

^cIncludes Hispanic, American Indian, Alaskan Native, Asian or Pacific Islander, and Other