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Table 2 Number of events (per pregnancy (n = 177) unless otherwise stated)

From: First-trimester ultrasound measurements and maternal serum biomarkers as prognostic factors in monochorionic twins: a cohort study

 

N (%)

Uncomplicated monochorionic diamniotic twin pregnancy, delivered > 34 weeks gestation

55/177 (31.07)

Fetal composite*

94/177 (53.11)

Twin-twin transfusion syndrome

23/177 (12.99)

Antenatal growth restriction

41/177 (23.16)

Antenatal growth restriction (per fetus)

73/354 (20.6)

Postnatal growth restriction

43/177 (24.29)

Postnatal growth restriction (per baby)

54/354 (15.25)

Intrauterine fetal death (single)

11/177 (6.21)

Intrauterine fetal death (double)

12/177 (6.78)

Maternal antenatal and postnatal composite **

46/177 (25.99)

Spontaneous preterm birth at 24–34 weeks

12/177 (6.78)

Neonatal composite **

91/340 (26.76)

  1. *Fetal composite included at least one of the following: twin-twin transfusion syndrome, antenatally detected growth restriction, postnatally detected growth restriction, twin anaemia polycythaemia sequence, or intrauterine fetal death
  2. **see Additional file 1 for full definitions of these composites