Table 5.

Relative increase in PCDD/F dust concentrations with respect to categories of facility-type annual average inverse-distance-weighted index (AEI), based on multivariable linear regression models.^a

Congener	Facility-Type AEI	Category (Reference: AEI=0)	Relative Increase (95% Cl)	P-Value for Trend	R2b
PCDDb
2,3,7,8-TCDDc,d	Medical Waste Incinerator	≤median	1.82 (1.09, 3.04)	0.01	0.25
		>median	2.21 (1.27, 3.84)
1,2,3,7,8-PeCDDc,d,e	Medical Waste Incinerator	≤median	1.58 (0.93, 2.66)	0.17	0.18
		>median	1.59 (0.9, 2.81)
1,2,3,4,7,8-HxCDDd,f,g	Medical Waste Incinerator	≤median	1.61 (0.95, 2.71)	0.10	0.17
		>median	1.74 (0.98, 3.09)
1,2,3,6,7,8-HxCDDc,d,g	Medical Waste Incinerator	≤median	1.47 (0.87, 2.5)	0.05	0.24
		>median	1.89 (1.07, 3.35)
1,2,3,7,8,9-HxCDDd,f	Medical Waste Incinerator	≤median	1.53 (0.92, 2.54)	0.05	0.20
		>median	1.84 (1.06, 3.2)
1,2,3,4,6,7,8-HpCDDd,f,g	Medical Waste Incinerator	≤median	1.37 (0.84, 2.23)	0.13	0.23
		>median	1.58 (0.93, 2.7)
OCDDc,d,g	Solid Waste Incinerator	≤median	1.06 (0.52, 2.13)	0.10	0.17
		>median	1.81 (0.89, 3.68)
PCDFb
2,3,7,8-TCDFd,g	Medical Waste Incinerator	≤median	1.35 (0.91, 2)	0.10	0.29
		>median	1.46 (0.97, 2.19)
	Solid Waste Incinerator	≤median	1.26 (0.74, 2.14)	0.01
		>median	1.74 (1, 3.02)
1,2,3,7,8-PeCDFc,g	Solid Waste Incinerator	≤median	1.53 (0.77, 3.03)	0.00	0.14
		>median	3.11 (1.58, 6.1)
2,3,4,7,8-PeCDFd,e	Solid Waste Incinerator	≤median	1.49 (0.74, 2.98)	0.08	0.26
		>median	1.94 (0.93, 4.05)
1,2,3,4,7,8-HxCDFc,d	Solid Waste Incinerator	≤median	1.35 (0.68, 2.66)	0.01	0.22
		>median	2.54 (1.28, 5.06)
1,2,3,6,7,8-HxCDFc,d	Solid Waste Incinerator	≤median	1.16 (0.52, 2.59)	0.05	0.16
		>median	2.23 (0.99, 5.01)
1,2,3,4,6,7,8-HpCDFc,d,g	Solid Waste Incinerator	≤median	0.63 (0.3, 1.3)	0.01	0.35
		>median	2.85 (1.35, 6)
	Coal-Fired Plant	≤median	1.63 (0.93, 2.87)	0.25
		>median	1.38 (0.77, 2.5)
1,2,3,4,7,8,9-HpCDFc	Solid Waste Incinerator	≤median	0.48 (0.16, 1.4)	0.02	0.19
		>median	3.41 (1.17, 9.93)
OCDFd,e,g	Solid Waste Incinerator	≤median	1.04 (0.49, 2.22)	0.06	0.28
		>median	3.42 (1.42, 8.24)
	Sewage Waste Incinerator	≤median	2.05 (1.04, 4.02)	0.83
		>median	1.11 (0.51, 2.41)
	Coal-Fired Plant	≤median	1.83 (1.02, 3.27)	0.52
		>median	1.18 (0.63, 2.2)
TEQc,g	Medical Waste Incinerator	≤median	1.19 (0.74, 1.93)	0.07	0.25
		>median	1.59 (0.98, 2.6)
	Solid Waste Incinerator	2	1.08 (0.56, 2.05)	0.03
		3	1.89 (0.96, 3.72)

CI, confidence interval; TEQ, toxic equivalence; TCDD, tetrachlorodibenzodioxin; PeCDD, pentachlorodibenzodioxin; HxCDD, hexachlorodibenzodioxin, HpCDD, heptachlorodibenzodioxin; OCDD, octachlorodibenzodioxin; TCDF, tetrachlorodibenzofuran; PeCDF, pentachlorodibenzofuran; HxCDF, hexachlorodibenzofuran, HpCDF, heptachlorodibenzofuran; OCDF, octachlorodibenzofuran

^aRegression models compare ln(PCDD/F) concentration in dust (dependent variable) versus categorical facility-type AEIs and other covariates with p<0.1 (independent variables). AEI not associated with dust concentrations of 2,3,4,6,7,8-HxCDF; 1,2,3,7,8,9-HxCDF excluded due to low detection rate.

^bAll models adjusted for Study Center

^cAdjusted for home type (single family home vs. other)

^dAdjusted for year the home was built

^eAdjusted for race

^fAdjusted for population density

^gStudy center variable had p<0.1