Skip to main content
. Author manuscript; available in PMC: 2018 Feb 15.
Published in final edited form as: Sci Total Environ. 2016 Dec 22;580:1276–1286. doi: 10.1016/j.scitotenv.2016.12.090

Table 4.

Increase in PCDD/F dust concentrations (pg/g) and the TEQ (pg/g) associated with average exposure indices (pg TEQ/km2/yr), based on multivariable regression models.

PCDD/F in Dust Regression Coefficient (β)a 95% CI % Increase in PCDD/F Dust Concentration with 2-fold increase in the AEIb R2 of Multivariable Model
PCDDc
2,3,7,8-TCDDd 0.110 (0.039, 0.181)** 7.9 0.21
1,2,3,7,8-PeCDDd,e 0.042 (−0.032, 0.117) 3.0 0.13
1,2,3,4,7,8-HxCDDf 0.037 (−0.040, 0.114) 2.6 0.10
1,2,3,6,7,8-HxCDDd,f,g 0.066 (−0.011, 0.143)* 4.7 0.22
1,2,3,7,8,9-HxCDDf,h 0.067 (−0.007, 0.141)* 4.8 0.17
1,2,3,4,6,7,8-HpCDDf,h,g 0.062 (−.009, 0.132)* 4.4 0.23
OCDDf.h,g 0.046 (−0.026, 0.117) 3.2 0.19
PCDFc,i
2,3,7,8-TCDFf,g 0.073 (0.019, 0.127)** 5.2 0.26
1,2,3,7,8-PeCDFd,f,g 0.066 (−0.004, 0.137)* 4.7 0.22
2,3,4,7,8-PeCDFd,e,f 0.041 (−0.030, 0.112) 2.9 0.27
1,2,3,4,7,8-HxCDFd,f 0.065 (−0.005, 0.136)* 4.6 0.19
1,2,3,6,7,8-HxCDFd,e,f 0.021 (−0.062, 0.104) 1.5 0.16
2,3,4,6,7,8-HxCDFe,f 0.000 (−0.081, 0.081) 0.0 0.15
1,2,3,4,6,7,8-HpCDFd,f,g 0.029 (−0.048, 0.106) 2.0 0.27
1,2,3,4,7,8,9-HpCDFd 0.036 (−0.073, 0.145) 2.5 0.13
OCDFd,f 0.028 (−0.049, 0.105) 1.9 0.16
TEQf,h,g 0.063 (−0.003, 0.130)* 4.5 0.20

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

a

Regression models compare ln(PCDD/F) concentration in dust (dependent variable) versus ln(AEI) and other covariates with p<0.1 (independent variables)

b

% increase in dust concentration on per each 2-fold change in AEI calculated as 2.0β

c

All models adjusted for Study Center

d

Adjusted for home type (single family home vs. other)

e

Adjusted for race

f

Adjusted for year the home was built

g

Study center variable had p<0.1

h

Adjusted for population density

I

1,2,3,7,8,9-HxCDF excluded due to low detection rate

*

p<0.1

**

p<0.05