Table 1.

Demographic variables by categories of highest known arsenic concentration in drinking water (μg/L)

Arsenic:		<11		11–200		>200
Variable	Group	N	%	N	%	N	%
Age (years)	<44	56	27.5	58	27.9	102	26.6
	44–49	113	55.4	95	45.7	183	47.8
	>49	35	17.2	55	26.4	98	25.6
Sex	Female	118	57.8	102	49.0	173	45.2
	Male	86	42.2	106	51.0	210	54.8
Ethnicity	Hispanic	130	63.7	164	78.8	382	99.7
	Aymara	58	28.4	35	16.8	0	0
	Other	16	7.8	9	4.3	1	0.3
Ever smoker	No	107	52.5	99	47.6	194	50.7
	Yes	97	47.5	109	52.4	189	49.3
Smoking rate (cigs/day)a	>0–5	63	64.9	62	56.9	103	54.8
	5–19	29	29.9	37	33.9	65	34.6
	20+	5	5.2	10	9.2	20	10.6
Secondhand smokeb	No	97	90.7	79	84.9	175	90.2
	Yes	10	9.3	14	15.1	19	9.8
Socioeconomic status scorec	Low	62	30.4	55	26.4	107	27.9
	Medium-high	142	69.6	153	73.6	276	72.1
Body mass index (kg/m2)	<25	49	24.0	44	21.2	95	24.8
	25–29	105	51.5	91	43.8	204	53.3
	30+	50	24.5	73	35.1	84	21.9
Education (highest grade)	High school	50	24.5	61	29.3	112	29.2
	Some college	85	41.7	84	40.4	163	42.6
	College	69	33.8	63	30.3	108	28.2
Occupational exposured	No	158	77.5	143	68.8	299	78.1
	Yes	46	22.5	65	31.3	84	21.9
Spirometry grade	<4	3	1.5	2	1.0	32	8.4
	>=4	201	98.5	206	99.0	351	91.6

^aAverage cigarettes smoked per day when smoking, only in smokers

^bAt least six months exposure as a child or adult in never smokers

^cLow, lower tertile; High, higher two tertiles

^dEver vs. never exposed to fiberglass, silica, diesel exhaust, wood dust, arsenic, asbestos, welding fumes, other fumes, coke oven emissions, soot, acrylic, beryllium, or radon at work