Brown 1982.

Methods	RCT.
Participants	401 women considered at increased risk for complications between 32 and 36 weeks of pregnancy.
Interventions	Intervention: CTG revealed performed weekly from 34 weeks (30 minute duration) and more often if indicated, assessed by scoring system of Pearson and Weaver. Other care included biochemical assessment and ultrasound. (N = 201). Control: CTG concealed performed as above, other care as per intervention group. (N = 200).
Outcomes	Apgar scores, admission to SCBU, neonatal acid base status, mode of birth, birthweight, gestational age, abnormal FH in labour, perinatal mortality, onset of labour.
Notes	Subgroups: increased risk/singletons or multiples/< 37 weeks at trial entry. Outcomes not specified in the review protocol: this study also assessed: spontaneous vaginal births; vaginal breech births; use of forceps; Apgar score < 7 at 1 minute; low Apgar scores at 5 minutes; birthweight.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	" ...computer randomised..."
Allocation concealment (selection bias)	Unclear risk	" ...computer randomised series of numbered envelopes..."; however, we are not sure if the envelopes were opaque.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Participant: yes. Clinician: no, it was not possible to blind clinicians. We have scored this 'no' as the clinician will make many of the judgements regarding care and outcomes, particularly the primary outcome of CS could be biased by the intervention not being blinded.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Blinding of outcomes assessors not described.
Incomplete outcome data (attrition bias) All outcomes	High risk	48 (25%) women excluded post randomisation, and not assessed with CTG. We could only re‐include the data on PNM because it was reported that there were no deaths or morbidity in the babies excluded after randomisation.
Selective reporting (reporting bias)	Unclear risk	We have not assessed the trial protocol.
Other bias	Low risk	There are no obvious other biases.