Table 1.
Characteristics of the Study Population.
| Variables | n | % |
|---|---|---|
| Family income (quintile) | ||
| 1st (lowest) | 14,599 | 20 |
| 2nd | 14,636 | 20 |
| 3rd | 14,613 | 20 |
| 4th | 14,612 | 20 |
| 5th (highest) | 14,607 | 20 |
| Maternal country at birth | ||
| Well developed | 59,633 | 81 |
| Underdeveloped | 14,025 | 19 |
| Parity | ||
| 1 child | 34,377 | 47 |
| ≥2 children | 39,281 | 53 |
| Maternal education level, y | ||
| ≤9 | 6,747 | 9 |
| 10 to 12 | 28,929 | 40 |
| ≥13 | 37,537 | 51 |
| Marital status | ||
| Cohabiting parents | 58,915 | 80 |
| Single | 14,743 | 20 |
| Maternal age at delivery, y | ||
| <25 | 10,551 | 14 |
| 25 to 34 | 45,741 | 62 |
| >34 | 17,366 | 24 |
| Smoking during pregnancy | ||
| No | 60,535 | 92 |
| Yes | 5,336 | 8 |
| Obesity | ||
| No | 55,100 | 93 |
| Yes | 4,388 | 7 |
| Maternal health condition | ||
| Healthy | 63,209 | 87 |
| Not healthy | 9,849 | 13 |