PE <34 weeks (n=11) PE <37 weeks (n=30) No PE <37 weeks (n=2611)
Age in years, median (IQR) 34 (32-37) 35.5 (31-38)† 32 (28-36)§
BMI in kg/m2, median (IQR) 23.1 (22.5-32.1) 24.0 (22.5-27.6) 23.8 (21.3-27.5)
Ethnicity
White 10 (90.9%) 25 (83.3%) 2209 (84.6%)
Black 0 (0.0%) 1 (3.3%) 71 (2.72%)
Mixed 1 (9.1%) 2 (6.7%) 209 (8.0%)
Asian 0 (0.0%) 2 (6.7%) 63 (2.41%)
South-east Asian 0 (0.0%) 0 (0.0%) 59 (2.26%)
Smoking during pregnancy 1 (9.1%) 3 (10.0%) 309 (11.8%)
ART 1 (9.1%) 2 (6.7%) 93 (3.6%)
Insemination 1 (9.1%) 1 (3.3%) 16 (0.6%)
IVF 0 (0.0%) 1 (3.3%) 77(2.95%)
IVF with egg donation 0 (0.0%) 1 (3.3%) 25 (0.96%)
Medical history
Chronic Hypertension 3 (27.3%)† 5 (16.7%)† 24 (0.9%) ‡§
Diabetes mellitus 0 (0.0%) 1 (3.3%) 35 (1.3%)
Autoimmune disease 0 (0.0%) 3 (10.0%) 105 (4.0%)
APS 0 (0.0%) 1 (3.3%) 8 (0.3%)
Obstetric history
Nulliparous 2 (18.2%) 13 (43.3%) 1219 (46.7%)
Previous preeclampsia 2 (18.2%)† 5 (16.7%)† 30 (1.1%)‡§
Biophysical variables
GA at the time of first-trimester ultrasound scan in weeks, median (IQR) 12.7 (12.3-13.3) 12.7 (12.3-13.3) 12.6 (12.1-13)
MAP in mmHg, median (IQR) 96 (88.3-104.3)† 91.2 (86.7-97.3)† 84.3 (78.7-90.7)‡§
MoM MAP, median (IQR) 1.14 (1.10-1.37)† 1.14 (1.10-1.29)† 1.06 (0.97-1.14)‡§
Mean UtAPI, median (IQR) 2.25 (1.89-3.05)†§ 1.91 (1.71-2.31)†‡ 1.68 (1.34-2.05)‡§
MoM UtAPI, median (IQR) 1.32 (1.12-2.13)† 1.19 (1.01-1.44)† 1.03 (0.84-1-26)‡§
Biochemical variables
GA for PAPP-A + PlGF measurement, median (IQR) 11.4 (9.9-12.3) 10.9 (9.9-11.7) 10.6 (10-11.3)
PAPP-A in mU/L, median (IQR) 1373 (607.3-2291) 1158 (602.3-2291) 1358 (823.2-2370)
MoM PAPP-A, median (IQR) 0.73 (0.6-0.93)† 0.72 (0.57-1.05)† 1.05 (0.73-1.5)‡§
PlGF in pg/mL, median (IQR) 22.3 (19.0-29.8)† 25.0 (19.3-31.7)† 32.2 (24.3-43.0)‡§
MoM PlGF, median (IQR) 0.69 (0.52-1.05)† 0.78 (0.63-0.98)† 0.96 (0.76-1.19)‡§