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. Author manuscript; available in PMC: 2013 Aug 5.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2013 Jan 9;23(4):371–377. doi: 10.1038/jes.2012.117

Table 2.

Mean concentrations of PAH-DNA adducts in cord and maternal blood together with prenatal ambient pollutants grouped by the prenatal airborne B[a] level (in tertiles)

Variables Prenatal B[a]P exposure level (in tertiles) p-level for nonparametric trend
<= 1.15 ng/m3 1.16 – 5.69 ng/m3 >5.69 ng/m3
Cord blood adducts per 108 nucleoides 0.24 (0.22 – 0.26) 0.25 (0.23 – 0.27) 0.30 (0.27 – 0.32) z = 3.50
p <0.001
Maternal blood adducts per 108 nucleoides 0.25 (0.23 – 0.27) 0.26 (0.24 – 0.28) 0.27 (0.25 – 0.30) z = 1.63
p = 0.103
Prenatal PAH in ng/m3 7.7 (7.0 – 8.3) 26.8 (24.6 – 28.5) 102.3 (93.4 – 111.3) z = 17.72
p < 0.001
Prenatal PM2.5 μg/m3 28.9 (26.1 – 31.7) 36.1 (32.9 – 39.3) 58.5 (53.4 – 63.7) z = 10.17
p <0.001
Weighted mean number of cigarettes smoked by others daily at home 1.45 1.34 2.19 z = −0.88
p =0.881

In brackets: 95% confidence interval