TABLE 1.
Participant Characteristics According to Maternal
| Active Smoker (n = 17,014)
|
Nonsmoker (n = 57,053)
|
|||
|---|---|---|---|---|
| No. | (%) | No. | (%) | |
| Age (years) | ||||
| ≥20 | 790 | (4.6) | 645 | (1.1) |
| 21–30 | 9,689 | (57.0) | 28,475 | (49.9) |
| 31–40 | 6,401 | (37.6) | 27,280 | (47.8) |
| ≥41 | 134 | (0.8) | 653 | (1.1) |
| BMI (kg/m2)a | ||||
| <18.5 | 644 | (3.9) | 1,527 | (2.8) |
| 18.5–25 | 10,063 | (61.1) | 37,058 | (66.7) |
| 26–30 | 3,848 | (23.4) | 12,027 | (22.6) |
| ≥30 | 1,911 | (11.6) | 4,988 | (9.0) |
| Parity | ||||
| 0 | 8,789 | (51.7) | 25,430 | (44.6) |
| 1 | 5,427 | (31.9) | 20,996 | (36.8) |
| ≥2 | 2,798 | (16.4) | 10,627 | (18.6) |
| Marital statusb | ||||
| Married/cohabitating | 15,747 | (93.2) | 55,622 | (97.9) |
| Single/divorced/widowed/separated | 863 | (5.1) | 785 | (1.4) |
| Other | 292 | (1.7) | 414 | (0.7) |
| Educationc | ||||
| <High school | 6,082 | (37.9) | 9,172 | (16.9) |
| High school | 3,286 | (20.5) | 7,463 | (13.8) |
| >High school | 6,661 | (41.6) | 37,576 | (69.3) |
| Past year personal income | ||||
| <200 NOK | 7,456 | (43.8) | 17,618 | (30.9) |
| 200–299 NOK | 5,782 | (34.0) | 20,430 | (35.8) |
| ≥300 NOK | 3,776 | (22.2) | 19,005 | (33.3) |
| Passive smoke exposured | 2,841 | (16.9) | 2,400 | (4.2) |
| Preeclampsia | 604 | (3.6) | 1,960 | (3.4) |
| Gestational hypertension | 299 | (1.8) | 1,096 | (1.9) |
NOK, Norwegian currency (Krone).
a
2,001 women were missing information on BMI.
b
344 women were missing information on marital status.
c
3827 women were missing information on education.
d
397 women were missing information on passive smoke exposure.