Methods	Randomised controlled trial, pilot study recruiting alongside another larger trial
Participants	167 women with singleton pregnancies 24 to 36 weeks; outpatients; previous normal anatomy scan; ultrasound showing abdominal circumference < 10th percentile, 2 measures of umbilical artery Doppler resistive index < 95th centile, no oligohydramnios
Interventions	Twice-weekly versus fortnightly fetal surveillance. Surveillance methods include biophysical profile, nonstress tests, umbilical artery and middle cerebral artery Doppler, growth scans and uterine artery Doppler
Outcomes	Neonatal; gestational age at delivery, umbilical artery resistive index at delivery, abnormal umbilical artery at delivery, female sex, birthweight, birthweight < 10th percentile, ponderal index, ponderal index < 10th percentile, admission to neonatal nursery, neonatal hospital stay, acidosis at birth, hypogylcemia Maternal: spontaneous onset of labour, induction of labour, caesarean delivery, caesarean delivery for fetal distress, pre-eclampsia, gestational hypertension
Notes	Sample size calculated for main study, no prespecified single primary outcome for this pilot complementary study
Risk of bias
Item	Authors’ judgement	Description
Adequate sequence generation?	Yes	Computer-generated numbers.
Allocation concealment?	Yes	Central telephone randomisation service.
Blinding? All outcomes	Unclear	Not feasible to blind participant and unclear if clinician or outcome assessors were blinded
Incomplete outcome data addressed? All outcomes	Yes	No loss to follow up documented.