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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 1.

Characteristics of mothers and newborns included in the analysis

Variables PAH-DNA adducts in cord blood
Total
N=438
P-level
≤ 0.125 0.126–0.318 > 0.318
per 108 nucleoides n=160 per 108 nucleoides n=139 per 108 nucleoides n=139
Maternal age:
mean 27.69 27.42 27.38 27.51
SD 3.53 3.53 3.77 3.60 0.7153
Maternal education:
 elementary n (%) 13 (8.1) 13 (9.4) 18 (12.9) 44 (10.0) 0.1683
 secondary n (%) 33 (20.6) 33 (23.7) 41 (29.5) 107 (24.4)
 higher n (%) 114 (71.2) 93 (66.9) 80 (57.6) 287 (65.5)
Pre-pregnancy maternal BMI:
mean 21.46 20.83 21.43 21.25 0.1122
SD 3.285 2.318 2.813 2.864
Gestational age: (weeks) > 36
mean 39.56 39.52 39.59 39.56
SD 1.131 1.086 1.250 1.154 0.8718
Gender:
 Boys n (%) 87 (54.4) 68 (48.9) 69 (49.6) 224 (51.1)
 Girls n (%) 73 (45.6) 71 (51.1) 70 (50.4) 214 (48.9) 0.5859
Birth weight (g):
mean 3475.8 3399.8 3444.2 3441.6
SD 431.97 425.29 456.21 437.86 0.3255
Residence:
Inner city area n (%) 27 (16.9) 33 (23.7) 33 (23.7) 93 (21.2) 0.2390
Outer city area n (%) 133 (83.1) 106 (76.3) 106 (76.3) 345 (78.8)
Prenatal ETS (+) n (%) 40 (25.0) 30 (21.6) 45 (32.4) 115 (26.3) 0.1116
Maternal adducts
mean 0.207 0.261 0.317 0.263 0.0001
SD 0.108 0.111 0.117 0.144