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Table 1 Demographic characteristics of women with singleton births in the period 1992-2010

From: Deliveries among teenage women – with emphasis on incidence and mode of delivery: a Swedish national survey from 1973 to 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%)
  1. Figures denote means and one SD or numbers and proportions.
  2. BMI = body mass index.
  3. Reported length, weight and smoking habits at first antenatal visit.