Table 1. Maternal characteristics and infant characteristics in the second pregnancy
Live birth (n= 883,422) Stillbirth (n= 2,428)
Age (years), mean (SD) 29.6 (4.6) 30.2 (5.0)
Age (years), (n, %)
<20 4,066 (0.4) 20 (0.8)
20-29 440,475 (49.8) 1,108 (45.6)
30-39 421,130 (47.6) 1,218 (50.1)
≥40 17,751 (2.0) 82 (3.3)
Smoking, (n, %)
Non-smokers 726,149 (82.2) 1,829 (75.3)
1-9 cigarettes/day 73,248 (8.2) 211 (8.6)
≥ 10 cigarettes/day 36,623 (4.1) 146 (6.0)
Missing 47,402 (5.3) 242 (9.9)
Body mass index kg/m2, (n, %)
Underweight: <18.5 22,722 (2.5) 36 (1.4)
Normal: ≥18.5 to <25 445,420 (50.4) 959 (39.5)
Overweight: ≥25 to <30 158,019 (17.8) 490 (20.1)
Obese: ≥30 63,832 (7.2) 283 (11.6)
Missing 193,429 (21.9) 660 (27.1)
Country of origin, (n, %)
Sweden 752,195 (85.1) 1,976 (81.0)
Other Scandinavian 22,039 (2.4) 45 (1.8)
Non-Scandinavian 108,079 (12.2) 402 (16.5)
Missing 1,109 (0.1) 14 (0.5)
Diabetes, (n, %) 5,968 (0.6) 45 (1.8)
Cardiovascular disease, (n, %) 1,057 (0.1) 4 (0.1)
Chronic hypertension, (n,%) 4,538 (0.5) 35 (1.4)
Hypertensive disorders of pregnancy, (n, %)* 19,112 (2.1) 65 (2.6)
Gestational diabetes, (n, %) 5,508 (0.6) 27 (1.1)
Types of delivery, (n,%)
Spontaneous VB 727,531 (85.7) 1,974 (86.0)
Vacuum/forceps 21,803 (2.5) 34 (1.4)
Pre -labour CD 55,577 (6.5) 66 (2.8)
In-labour CD 38,223 (4.5) 192 (8.3)
Unspecified CD 5,393 (0.6) 27 (1.1)
Year of first birth, (n, %)
1982-1989 132,873 (15.0) 333 (13.7)
1990-1999 329,875 (37.3) 904 (37.2)
2000-2012 420,674 (47.6) 1,191 (49.0)
Gestational age at birth in weeks, mean (SD) 39.4 (1.6) 35.3 (4.5)
Birthweight in grams, mean (SD) 3616.7 (539.1) 2545.3 (1053.5)
Sex, (n, %)
Female 429,129 (48.5) 1,205 (49.7)
This include preeclampsia and gestational hypertension *This include preeclampsia and gestational hypertension *This include preeclampsia and gestational hypertension