Hemminki 1990b.

Methods	See Hemminki 1990a.
Participants	See Hemminki 1990a. 161 women were enrolled in Trial B (81 in the support group and 80 in control).
Interventions	Trial B: in 1988, the intervention was support by a new group of midwifery students. All students were involved in the trial, not just volunteers. The students were permitted to leave their participants to witness other interventions and deliveries. The control group "was cared for according to the normal routine of the midwife" and by a medical student as enrolment was limited to days when medical students were on duty. Slightly fewer than 70% of fathers were present
Outcomes	See Hemminki 1990a
Notes	Not stated if epidural analgesia was available or if EFM was used routinely Dates of study: "autumn 1988" Funding: Study supported by a grant from the Finnish Academy of Sciences. Conflicts of interest: not reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No details provided
Allocation concealment (selection bias)	Unclear risk	The block size was reduced from the first study. "To lessen the frustration resulting from opening a code for a control mother, randomisation envelopes contained a maximum of two similar codes in sequence (not told in advance)". "Put into non‐transparent envelopes". The envelope was opened in the labour ward. It was not stated if the envelopes were consecutively numbered
Blinding of participants and personnel (performance bias) All outcomes	High risk	No mention of blinding of participants and personnel, but blinding of participants and personnel is not possible
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No mention of blinding of outcome assessment
Incomplete outcome data (attrition bias) All outcomes	Low risk	Medical record data were collected on 100% of the sample. A questionnaire was administered at 2‐3 days postpartum and completed by 93.7% of the sample
Selective reporting (reporting bias)	Low risk	All outcomes were reported
Other bias	High risk	Mothers were told the purpose of the study differentially (see methods for Trial A above)