Maternal characteristics
Live births (n=131,037)
Stillbirths
Stillbirths
All (n=477) Placental dysfunction (n=261)
Age in years, median (IQR) 31.1 (26.7-34.9) 31.0 (26.4-35.5) 30.7 (26.1-35.7)
Weight in Kg, median (IQR) 67.2 (59.7-78.1) 72.6 (63.2-85.0) 74.6 (62.6-85.6)
Height in cm, median (IQR) 165 (160-169) 165 (160-168) 164 (160-168)
Racial origin
White, n (%) 95,575 (72.9) 270 (56.6) 131 (50.2)
Black, n (%) 23,397 (17.9) 170 (35.6) 107 (41.0)
South Asian, n (%) 6,045 (4.6) 18 (3.8) 13 (5.0)
East Asian, n (%) 2,496 (1.9) 7 (1.5) 5 (1.9)
Mixed, n (%) 3,524 (2.7) 12 (2.5) 5 (1.9)
Method of conception
Spontaneous, n (%) 126,500 (96.5) 457 (95.8) 150 (96.6)
Assisted conception, n (%) 4,537 (3.5) 20 (4.2) 9 (3.5)
Cigarette smoking, n (%) 12,178 (9.3) 64 (13.4) 32 (12.3)
Chronic hypertension, n (%) 1,650 (1.3) 21 (4.4) 18 (6.9)
SLE / APS, n (%) 281 (0.2) 2 (0.4) 2 (0.8)
Diabetes mellitus, n (%) 1,362 (1.0) 13 (2.7) 7 (2.7)
Parity
Nulliparous, n (%) 62,084 (47.4) 236 (49.5) 128 (49.0)
Previous stillbirth, n (%) 975 (0.7) 21 (4.4) 16 (6.1)
Previous SGA, n (%) 9,573 (7.3) 57 (12.0) 37 (14.2)
Previous preeclampsia, n (%) 3713 (2.8) 41 (8.6) 30 (11.5)
Inter-pregnancy interval in years, median (IQR)a 2.9 (1.8 - 4.8) 3.6 (2.1-6.6) 4.2 (2.4-7.3)