Table 2.

HRs and 95% CIs for breast cancer associated with solvent job exposure

		Cases^a
		N = 1,255	Adjusted
	Person-years	n (%)	HR^b (95% CI)
Solvent job
Ever	30,386	163 (13)	1.04 (0.88–1.24)
Never	195,219	1,092 (87)	Ref
Total duration of solvent job(s) exposure, y
10+	12,597	77 (6)	1.14 (0.90–1.45)
5 to <10	7,368	36 (3)	0.96 (0.68–1.35)
1 to <5	10,422	50 (4)	0.98 (0.74–1.32)
Never	195,219	1,092 (87)	Ref
Trend^c			P = 0.35
Frequency of solvent exposure
1+/wk	6,666	37 (3)	0.97 (0.69–1.37)
<1/wk	23,034	123 (10)	1.07 (0.88–1.30)
Never	195,219	1,092 (87)	Ref
Time period of first solvent job
Before 1980	14,898	98 (8)	1.16 (0.93–1.44)
1980 and after	15,448	65 (5)	0.91 (0.70–1.18)
Never	195,219	1,092 (87)	Ref
Time since last solvent job at baseline interview
5+ y	20,177	113 (9)	1.05 (0.86–1.29)
Current to <5 y	10,170	50 (4)	1.03 (0.77–1.38)
Never	195,219	1,092 (87)	Ref
Age at first solvent job at baseline interview, y
35+	7,328	41 (3)	1.04 (0.76–1.44)
25 to <35 y	8,457	42 (3)	0.97 (0.70–1.34)
20 to <25 y	7,903	39 (3)	0.95 (0.68–1.32)
<20	6,658	41 (3)	1.27 (0.92–1.75)
Never	195,219	1,092 (87)	Ref
Trend^c			P = 0.73
Timing of first solvent job
Before first birth	9,613	57 (5)	1.24 (0.95–1.63)
After first birth	14,509	75 (6)	0.98 (0.76–1.26)
Nulliparous	6,189	31 (2)	0.92 (0.63–1.33)
Never	195,219	1,092 (87)	Ref
Duration of solvent job(s) exposure relative to first birth^d
5+ y before first birth	3,046	21 (2)	1.42 (0.92–2.20)
3 to <5 y before first birth	2,763	18 (2)	1.30 (0.80–2.10)
<3 y before first birth	3,804	18 (2)	0.92 (0.57–1.49)
After first birth	14,509	75 (7)	0.97 (0.75–1.25)
Never	159,720	901 (87)	Ref
Trend^c			P = 0.04

NOTE: Differences in the total numbers of cases are due to missing values. Significant P values (<0.05) are in bold font.

↵^aExcluding 25 cases missing information on date of diagnosis.
↵^bHRs are adjusted for race/ethnicity, education, income, parity, and age at first birth.
↵^cTest for trend among solvent-exposed only.
↵^dAmong parous women only.