Table 4.

Cumulative Lifetime Pesticide Exposure and the Association With Prevalent Chronic Bronchitis Among Non-Smoking Farm Women in the AHS (1993–7).

Duration of Pesticide Use	Chronic Bronchitis (n=583) %	Controls (n=20,958) %	Odds Ratio*	95% Confidence Interval	p-trenda
Years					0.12
none	51	49	1.00
1	5	5	1.51	(1.00, 2.26)
2–5	10	13	0.99	(0.72, 1.35)
6–10	9	9	1.18	(0.85, 1.64)
11–20	12	12	1.14	(0.85, 1.53)
21–30	7	6	1.18	(0.82, 1.70)
30+	8	5	1.30	(0.91, 1.85)
Days per year					0.001
none	51	49	1.00
1–5	22	25	1.02	(0.75, 1.38)
5–9	11	11	1.35	(1.00, 1.84)
10–19	10	8	1.80	(1.22, 2.66)
20–39	6	3	1.57	(0.84, 2.91)
40+	2	1	1.79	(1.20, 2.67)
Lifetime daysb					0.02
none	51	49	1.00
1–9	12	13	1.20	(0.89, 1.61)
10–39	9	12	0.90	(0.65, 1.25)
40–119	11	12	1.02	(0.76, 1.37)
120–7000	19	12	1.50	(1.17, 1.91)
Pesticide Use Patternsc					0.01
none	35	37	1.00
Residential pesticidesd	9	9	1.17	(0.86, 1.59)
Most used pesticidese	30	31	1.11	(0.90, 1.38)
1–2 Agricultural pesticidesf	13	13	1.09	(0.83, 1.43)
3+ Agricultural pesticidesg	13	9	1.58	(1.19, 2.09)

Odds ratios adjusted for age and state.

^achi-square test for trend based on categories shown

^btotal lifetime days is the product of the midpoints of year and days-per-year categories

^cas defined by Kirrane et al, 2004 (13)

^dreported using pesticides for home or garden only

^eexposure to at least one commonly used pesticide: glyphosate, 2,4-D, malathion, diazinon, carbaryl

^f1 to 2 predominantly agricultural pesticides in addition to the commonly used products

^g3 or more predominantly agricultural pesticides in addition to the commonly used products