Table 1 Demographic characteristics of the study participants
From: Smoking-associated AHRR demethylation in cord blood DNA: impact of CD235a+ nucleated red blood cells
| Â | Maternal smoking status | Â | |
|---|---|---|---|
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 |