Methods	“Prospective randomised controlled study.”
Participants	“214 singleton high risk pregnancies.”
Interventions	“Modified biophysical profile following vibroacoustic stimulation (VAS/mFBP) versus mock stimulation (mFBP).”
Outcomes	Data were provided for the subgroup of 28 cases with decreased fetal movements on the following outcomes Primary outcomes Perinatal mortality and severe morbidity. Caesarean section. Secondary outcomes Perinatal mortality. Components of severe perinatal morbidity (NICU admission > 24 hours, organ failure and encephalopathy). Labour induction. Maternal death or severe maternal morbidity. Components of severe maternal morbidity (ICU admission > 24 hours and organ failure). Maternal hospital admission > 7 days.
Notes
Risk of bias
Bias	Authors’ judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer-generated random sequence.
Allocation concealment (selection bias)	Low risk	Allocation concealment using sealed envelopes.
Blinding of participants and personnel (performance bias) All outcomes	High risk	No blinding.
Blinding of outcome assessment (detection bias) All outcomes	High risk	No blinding.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No indication ofincomplete outcome data.
Selective reporting (reporting bias)	Unclear risk	Unclear.
Other bias	Low risk	In the total sample of 214 singleton high-risk pregnancies at the outset of monitoring there were no significant differences between the 2 groups with respect to the maternal age, parity, gestational age and high-risk factors (intrauterine growth retardation, pregnancy-induced hypertension, adverse obstetric history, decreased fetal movements, postdated pregnancy, diabetes mellitus and antepartum haemorrhage)