Fig 1.
The change in customised centile between 28 weeks and 36 weeks (A) and 28 weeks and birth (B) was calculated as the later fetal weight centile minus the earlier fetal weight centile.
A fetus slowing in growth will thus have a negative number to describe their weight centile change; a fetus that maintains growth will have a change of zero, and a fetus with an increase in growth will have a positive number to describe weight centile change.
Table 1.
Patient demographic and delivery details according to change in growth centile.
Fig 2.
Doppler assessments performed at 36 weeks according to change in weight centile.
MCA-PI according to weight centile change between the ultrasound performed at 28 weeks and 36 weeks (2a) MCA-PI according to weight centile change between the ultrasound performed at 28 weeks and birth (2b). CPR according to weight centile change between the ultrasound performed at 28 weeks and 36 weeks (2c) CPR according to weight centile change between the ultrasound performed at 28 weeks and birth (2d); UA-PI according to weight centile change between the ultrasound performed at 28 weeks and 36 weeks (2e) UA-PI according to weight centile change between the ultrasound performed at 28 weeks and birth (2f). * 5th, 50th and 95th centile for Middle Cerebral Artery Pulsatility Index and Cerebroplacental Ratio at 36 weeks gestation (12); ** 5th, 50th and 95th centile for Umbilical Artery Pulsatility Index at 36 weeks gestation (13).
Fig 3.
Doppler assessments performed at 36 weeks according to change in fetal growth centile by categories; (i) <20% fall in customised centile between 28 week ultrasound and birth (n = 30), (ii) 20–30% fall in customised centile between 28 week ultrasound and birth (n = 9), (iii) >30% fall in customised centile between 28 week ultrasound and birth (n = 9) for MCA-PI (Fig 3a), CPR (Fig 3b) and UA-PI (Fig 3c).
Fig 4.
Receiver-operating curves for the outcome of operative delivery (emergency CS or operative vaginal delivery) for suspected fetal compromise among those who underwent labour (n = 12/43) using customised birthweight centile (Fig 4a), change in fetal weight centile between 28–36 weeks (Fig 4b) and change in fetal weight centile between 28 weeks-birth (Fig 4c).