Table 1.
Demographic characteristics of women with singleton births in the period 1992-2010
|
Age groups | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Characteristic |
< 16 years |
16-17 years |
18-19 years |
20-30 years |
|||||
| (n=472) | (n=5376) | (n=23560) | (n=893505) | ||||||
| BMI (kg/m2)† |
22.8 |
(3.4) |
22.8 |
(3.8) |
23.3 |
(4.2) |
24.1 |
(4.3) |
|
| Smoking† |
105 |
(22.7%) |
1830 |
(34.7%) |
7239 |
(31.3%) |
114278 |
(12.8%)) |
|
| Parity: |
1 |
469 |
(99.4%) |
5208 |
(96.9%) |
21287 |
(90.4%) |
471470 |
(52.8%) |
| |
2 |
3 |
(0.6%) |
163 |
(3.0%) |
2131 |
(9.0%) |
318522 |
(35.6%) |
| 3+ | 0 | (0%) | 5 | (0.1%) | 142 | (0.6%) | 103513 | (11.6%) | |
Figures denote means and one SD or numbers and proportions.
BMI = body mass index.
†Reported length, weight and smoking habits at first antenatal visit.