Table 1

Baseline characteristics of the study population

CharacteristicLow-dose aspirin,
n=179
No aspirin,
n=183
Screen and treat,
n=184
Age (years)33 (19–44)34 (18–43)33 (19–44)
Race, n (%)
 White181 (97.9)179 (95.7)180 (97.3)
 Black1 (0.5)2 (1.1)0 (0)
 Asian3 (1.6)6 (3.2)5 (2.7)
 Other00 (0)0 (0)
Completed secondary school, n (%)136 (73.5)143 (76.4)152 (82.2)
BMI (kg/m2)25.2 (17.4–39.4)22.9 (17.7–41.4)23.8 (18.1–45.2)
Gestational age (weeks)12.9 (11.1–13.9)12.9 (11.1–13.9)12.9 (11.3–13.9)
Smoking,n (%)17 (9.2)11 (5.9)7 (3.8)
Subject’s mother had pre-eclampsia,n (%)7 (3.8)10 (5.4)10 (5.4)
Conception, n (%)
 IVF5 (2.7)9 (4.8)8 (4.3)
 ICSI3 (1.6)4 (2.1)3 (1.6)
 Ovulation induction5 (2.7)6 (3.2)6 (3.2)
 Spontaneous172 (93.0)168 (89.9)170 (91.9)
Previous miscarriage, n (%)20 (10.8)31 (16.6)31 (16.8)
  • Where n (%) is not expressed, average and range are demonstrated.

  • BMI, body mass index, ICSI, intracytoplasmic sperm injection; IVF, in vitro fertilisation.