Table 1.
Characteristics of a Sample of Participants (n = 1,257) in the Maternal-Infant Research on Environmental Chemicals Study, Canada, 2008–2011
| Characteristic | No. | % | Mean (SD) |
|---|---|---|---|
| Maternal age, years | 33.1 (5.0) | ||
| Prepregnancy body mass indexa | 24.9 (5.4) | ||
| Gestational weight gain | |||
| Inadequate | 212 | 18.3 | |
| Adequate | 342 | 29.5 | |
| Excessive | 605 | 52.2 | |
| Missing | 98 | ||
| Nulliparous | 726 | 57.8 | |
| Educational level | |||
| High school diploma or less | 104 | 8.3 | |
| Trade school or some college | 361 | 28.7 | |
| Undergraduate university degree | 478 | 38.0 | |
| Graduate university degree | 312 | 24.8 | |
| Missing | 2 | ||
| Household income, Canadian dollars | |||
| ≤30,000 | 91 | 7.2 | |
| 30,001–50,000 | 117 | 9.3 | |
| 50,001–100,000 | 514 | 40.9 | |
| >100,000 | 487 | 38.7 | |
| Missing | 48 | ||
| White | 1,087 | 86.5 | |
| Maternal smoking | |||
| Never smoked or quit before pregnancy | 1,113 | 88.5 | |
| Quit smoking when pregnancy confirmed | 79 | 6.3 | |
| Current smoker | 65 | 5.2 | |
| Male infant sex | 672 | 53.5 | |
| Birth weight, g | 3,533.7 (453.0) | ||
| Cord blood leptin, ng/mL | 19.9 (25.5) | ||
| Cord blood adiponectin, µg/mL | 18.2 (12.1) |
a Body mass index was calculated as weight (kg)/height (m)2.