Table 1.

Baseline Characteristics by intensity-weighted lifetime exposure-days to terbufos, Agricultural Health Study (1993-1997)

	Terbufos Intensity-Weighted Lifetime Exposure-Days (n=44,624)
Characteristic	Non-exposed (n=28,135)		Tertile 1 >0-107 (n=5,722)		Tertile 2 >107-352 (n=5,204)		Tertile 3 >352 (n=5,563)
	Number	%	Number	%	Number	%	Number	%
Age (years)
< 40	10,818	38.45	2,076	36.28	1,784	34.28	1,951	35.07
40 – 49	7,650	27.19	1,779	31.09	1,623	31.19	1,771	31.84
50 – 59	5,380	19.12	1,110	19.40	1,098	21.10	1,147	20.62
≥ 60	4,287	15.24	757	13.23	699	13.43	694	12.48
Sex
Male	27,140	96.49	5,676	96.46	5,173	99.40	5,533	99.46
Female	995	3.54	995	0.80	31	0.60	30	0.54
Ethnicity
White	27,483	97.79	5,665	99.11	5,166	99.35	5,511	99.21
Black	484	1.72	31	0.54	25	0.48	34	0.61
Other	138	0.49	20	0.35	9	0.17	10	0.18
State
North Carolina	9,995	35.53	766	13.39	888	17.06	1,364	24.52
Iowa	18,140	64.47	4,956	86.61	4,316	82.94	4,199	75.48
Applicator type
Commercial	3,531	12.55	272	4.75	191	3.67	289	5.20
Farmer	24,604	87.45	5,450	95.25	5,013	96.33	5,274	94.80
Smoking
Never	14,921	53.03	3,392	59.28	3,034	58.30	3,091	55.56
Former	8,169	29.04	1,601	27.98	1,477	28.38	1,588	28.55
Current	5,045	17.93	729	12.74	693	13.32	884	15.89
Alcohol use in last 12 months
Yes	18,936	67.30	4,290	74.97	3,924	75.40	4,204	75.57
Education
≤ High school	15,456	54.94	2,975	51.99	2,751	52.86	3,061	55.02
> High school	12,679	45.06	2,747	48.01	2,453	47.14	2,502	44.98
Family history of cancer
Yes	11,055	39.29	2,489	43.50	2,256	43.35	2,434	43.75
Corn production
Yes	18,417	65.46	5,207	91.00	4,797	92.18	5,055	90.87
	Mean (SD)
Smoking (pack-years)
Former smokers	15.54 (19.92)		12.97 (16.80)		13.61 (17.71)		14.65 (19.43)
Current smokers	22.57 (20.15)		22.64 (21.11)		22.44 (18.85)		23.04 (19.55)
Number of other pesticides used	11.38 (6.83)		15.61 (6.95)		16.56 (7.35)		17.99 (7.35)
Follow-up (years)	10.61 (2.09)		10.54 (2.00)		10.50 (2.07)		10.54 (2.05)

Categorical variables presented as n, %; continuous variables presented as mean ± SD.