SGA <32 weeks (n=8) SGA <37 weeks (n=44) No SGA <37 weeks (n=2439)
Age in years, median (IQR) 31.5 (29-33) 32 (28.5-37) 32 (28-36)
BMI in kg/m2, median (IQR) 23.1 (21.9-24.5) 23.1 (20.2-26.4) 23.9 (21.4-27.6)
Ethnicity
White 159 (94.6%) 189 (93.6%) 2196 (84.6%)
Black 4 (2.4%) 6 (3.0%) 70 (2.7%)
Mixed 5 (3.0%) 5 (2.5%) 209 (8.1%)
Asian 0 (0.0%) 1 (0.5%) 64 (2.5%)
South-east Asian 0 (0.0%) 1 (0.5%) 58 (2.2%)
Smoking during pregnancy 0 (0.0%) 15 (34.1%)† 283 (11.6%)§
ART
Insemination 2 (1.2%) 3 (1.5%) 16 (0.6%)
IVF 6 (3.6%) 7 (3.5%) 77 (3.0%)
IVF with egg donation 0 (0.0%) 1 (2.3%) (% del total) 22 (0.9%)
Medical history
Chronic Hypertension 1 (12.5%)† 2 (4.5%) 27 (1.1%)‡
Diabetes mellitus 0 (0.0%) 2 (4.5%) 32 (1.3%)
Autoimmune disease 1 (12.5%) 2 (4.5%) 101 (4.1%)
APS 0 (0.0%)† 3 (6.8%) 6 (0.2%)‡
Obstetric history
Nulliparous 5 (62.5%) 20 (45.5%) 1126 (46.2%)
Previous preeclampsia 1 (12.5%)† 2 (4.5%) 32 (1.3%)‡
Biophysical variables
GA at the time of first trimester ultrasound scan in weeks, median (IQR) 12.4 (12.1-12.6) 12.4 (11.9-12.9) 12.6 (12.1-13)
MAP in mmHg, median (IQR) 90.8 (85.2-96) 86.7 (80-91.1) 84.3 (78.3-90.7)
MoM MAP, median (IQR) 1.14 (1.04-1.17) 1.07 (0.96-1.17) 1.05 (0.97-1.15)
Mean UtAPI, median (IQR) 1.88 (1.74-2.67) 1.94 (1.72-2.45)† 1.68 (1.34-2.04)§
MoM UtAPI, median (IQR) 1.12 (1.01-1.60) 1.20 (1.02-1.47)† 1.02 (0.84-1.25)§
Biochemical variables
GA for PAPP-A + PlGF measurement median (IQR) 11.4 (10.4-12.3) 10.7 (10-11.8) 10.6 (10-11.3)
PAPP-A in mU/L, median (IQR) 1801 (932.2-2456) 964.25 (631.0-1794.5) 1355 (816-2387)
MoM PAPP-A, median (IQR) 0.74 (0.6-0.89) 0.73 (0.55-1.1)† 1.06 (0.73-1.51)§
PlGF in pg/mL, median (IQR) 20.0 (18.1-26.1)† 28.2 (19.5-38.4) 32.1 (24.1-43.0)‡
MoM PlGF, median (IQR) 0.60 (0.42-0.79)† 0.72 (0.61-0.97)† 0.96 (0.75-1.18)‡§