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Table 1 Demographic characteristics of the study participants

From: Smoking-associated AHRR demethylation in cord blood DNA: impact of CD235a+ nucleated red blood cells

  Maternal smoking status  
Nonsmoker (n = 19) Smoker (n = 34)  
  Mean ± SD Mean ± SD p value (Welch’s t test)
Maternal age (years) 27.1 ± 4.9 27.4 ± 4.4 0.82
Gestational age (days) 275.6 ± 7.6 272.0 ± 10.6 0.16
Birthweight (g) 3382.1 ± 262.4 3130.6 ± 423.1 0.01
Cotinine (ng/mL) 2.0 ± 0.0 86.8 ± 85.1 2.43E−06
Cigarettes per day 7.9 ± 5.1
Years smoked 10.9 ± 6.6
  Percentage Percentage p value (two-tail Fisher’s exact test)
Infant sex female 52.6 55.9 0.99
African-American 52.6 53.1 0.99
C section 47.4 64.7 0.38
Progesterone use during pregnancy 5.3 2.9 0.99
Any environmental tobacco smoke (ETS) exposure 10.5 85.3 5.46E−08