Table 3.

Hazard ratios (HR) and 95% confidence intervals (CI) for total breast cancer and invasive breast cancer associated with cumulative exposure

	Total Breast Cancer		Invasive Breast Cancer
Cumulative Exposure (Quartiles)	Cases n=1,966	HR1	Cases n=1,421	HR1
Acids
>1456 days	21	1.3 (0.8, 2.0)	17	1.4 (0.8, 2.3)
520 – ≤1456 days	17	1.1 (0.7, 1.8)	12	1.1 (0.6, 1.9)
154 – ≤520 days	23	1.2 (0.7, 1.8)	13	0.8 (0.4, 1.5)
<154 days	13	0.9 (0.5, 1.6)	10	1.0 (0.6, 1.8)
Never Use	1,890	1.0	1,367	1.0
p value for trend2		0.32		0.21
Dyes or inks
>1560 days	26	1.2 (0.8, 1.8)	23	1.5 (1.0, 2.3)
520 – ≤1560 days	22	1.2 (0.8, 1.8)	15	1.1 (0.7, 1.8)
130 – ≤520 days	28	1.0 (0.7, 1.5)	27	1.3 (0.9, 2.0)
<130 days	22	1.1 (0.7, 1.5)	15	1.0 (0.6, 1.7)
Never Use	1,868	1.0	1,341	1.0
p value for trend2		0.47		0.31
Gasoline or other petroleum products
>1300 days	23	1.2 (0.8, 1.9)	19	1.4 (0.9, 2.3)
468 – ≤1300 days	17	0.9 (0.6, 1.5)	15	1.1 (0.7, 1.9)
139 – ≤468 days	13	0.6 (0.4, 1.2)	10	0.7 (0.4, 1.3)
<139 days	12	0.6 (0.3, 1.1)	9	0.7 (0.3, 1.3)
Never Use	1,899	1.0	1,366	1.0
p value for trend2		0.03		0.02
Glues or adhesives
>1612 days	37	0.9 (0.7, 1.3)	28	1.0 (0.6, 1.4)
520 – ≤1612 days	32	0.8 (0.6, 1.2)	22	0.8 (0.5, 1.3)
180 – ≤520 days	31	0.7 (0.5, 1.1)	22	0.8 (0.5, 1.2)
<180 days	43	1.2 (0.9, 1.6)	33	1.3 (0.9, 1.8)
Never Use	1,823	1.0	1,316	1.0
p value for trend2		0.53		0.52
Lubricating oils
>1872 days	8	0.8 (0.4, 1.6)	8	1.1 (0.5, 2.2)
624 – ≤1872 days	8	0.7 (0.3, 1.5)	6	0.9 (0.4, 1.9)
208 – ≤624 days	14	1.2 (0.7, 2.2)	12	1.6 (0.9, 2.8)
<208 days	9	0.8 (0.4, 1.5)	5	0.6 (0.3, 1.5)
Never Use	1926	1.0	1,389	1.0
p value for trend2		0.69		0.65
Metals
>1716 days	21	1.3 (0.9, 2.1)	15	1.3 (0.8, 2.2)
607 – ≤1716 days	16	0.8 (0.5, 1.4)	12	1.0 (0.6, 1.8)
195 – ≤607 days	12	0.9 (0.5, 1.5)	8	0.8 (0.4, 1.6)
<195 days	15	0.8 (0.5, 1.4)	11	0.8 (0.4, 1.5)
Never Use	1,901	1.0	1,375	1.0
p value for trend2		0.19		0.26
Paints
>1170 days	40	1.3 (0.9, 1.8)	26	1.1 (0.8, 1.7)
360 – ≤1170 days	25	0.9 (0.6, 1.4)	20	1.0 (0.7, 1.6)
104 – ≤360 days	20	0.8 (0.5, 1.2)	16	0.9 (0.5, 1.5)
<104 days	30	0.9 (0.6, 1.4)	26	1.2 (0.8, 1.8)
Never Use	1,850	1.0	1,332	1.0
p value for trend2		0.08		0.65
Pesticides
>780 days	7	1.1 (0.5, 2.3)	6	1.3 (0.6, 2.9)
240 – ≤780 days	8	1.2 (0.5, 2.4)	6	1.4 (0.9, 3.1)
60 – ≤240 days	9	1.2 (0.6, 2.3)	8	1.4 (0.7, 3.0)
<60 days	5	0.8 (0.3, 1.9)	5	1.1 (0.5, 2.7)
Never Use	1,936	1.0	1,396	1.0
p value for trend2		0.70		0.95
Soldering materials
>990 days	15	1.3 (0.8, 2.3)	10	1.4 (0.8, 2.6)
312 – ≤990 days	8	0.8 (0.4, 1.7)	6	0.9 (0.4, 1.9)
96 – ≤312 days	10	0.7 (0.4, 1.4)	9	0.9 (0.4, 1.8)
<96 days	14	1.3 (0.8, 2.2)	10	1.3 (0.7, 2.4)
Never Use	1,918	1.0	1,385	1.0
p value for trend2		0.85		0.90
Solvents
>1300 days	26	1.1 (0.7, 1.7)	19	1.1 (0.7, 1.8)
438 – ≤1300 days	19	0.8 (0.5, 1.2)	16	0.9 (0.5, 1.5)
120 – ≤438 days	37	1.6 (1.2, 2.3)	21	1.3 (0.9, 2.1)
<120 days	22	0.9 (0.6, 1.4)	17	0.9 (0.5, 1.5)
Never Use	1,849	1.0	1,339	1.0
p value for trend2		0.87		0.89
Stains
>576 days	4	0.5 (0.2, 1.2)	3	0.5 (0.2, 1.5)
180 – ≤576 days	5	0.6 (0.2, 1.4)	5	0.8 (0.3, 2.5)
52 – ≤180 days	10	1.3 (0.7, 2.5)	9	1.6 (0.8, 3.2)
<52 days	9	1.0 (0.5, 1.9)	5	0.7 (0.3, 1.8)
Never Use	1,938	1.0	1,399	1.0
p value for trend2		0.13		0.42

¹Hazard ratios are adjusted for race/ethnicity, education, income, parity and age at first birth

²Test for trend among exposed only

Note: Differences in the total numbers of cases are due to missing values