Chaharrahifard 2021.

Study characteristics
Methods	Study design: RCT Duration of study: the study was conducted from May to September 2018. Country: Iran Income classification: upper‐middle income country in 2018 Geographical scope: Karaj, Iran Healthcare setting: prenatal ward of Kamali Hospital, a provincial referral centre for mothers with high‐risk pregnancies
Participants	1. Age: adults but age not specified 2. Gender: female 3. Socioeconomic background: moderate economic level in 75.8% for the intervention group and 78.8% for control 4. Educational background: elementary education in 48.5% (intervention group) and 51.5% (control group) Inclusion criteria: a. being nulliparous; b. having the gestational age of 34 weeks and higher based on the last menstrual period or first sonography screening; c. being literate; d. being Iranian; e. being diagnosed with a high‐risk pregnancy; f. staying for at least three days in the prenatal ward of Kamali Hospital. Exclusion criteria: a. woman with lack of attendance to one group session; b. having a history of mental disorders; c. having a baby with physical and mental abnormalities; d. place of delivery outside Kamali Hospital. Note: at baseline, the intervention and control group scores for the Edinburgh Postnatal Depression Scale (EPDS) were, respectively, 10.96 (5.78) and 12.12 (6.39). Stated purpose: to investigate the effect of a midwife‐led psycho‐education intervention on parental stress, competency, and postpartum depression in nulliparous women hospitalized with a high‐risk pregnancy
Interventions	Name: midwife‐led psycho‐education intervention Title/name of PW and number: 1 midwife (trained MSc student of counselling in midwifery‐researcher) 1. Selection: not specified 2. Educational background: MSc student of counselling in midwifery 3. Training: not specified 4. Supervision: feedback from mothers at the end of each training session 5. Incentives/remuneration: not specified Prevention type: indicated prevention – participants were included based upon the presence of a risk factor (women with high‐risk pregnancies) and presented with some level of distress at baseline as indicated by Center for Epidemiologic Studies Depression Scale (CES‐D) scores. Intervention details: midwife‐led psychoeducation in 2 sessions for a period of approximately 60 to 90 minutes in addition to slides, booklets, and group discussions during admission to high‐risk pregnancy ward. They were then followed up by telephone until delivery, alongside two individual training sessions for approximately 60 minutes immediately after the delivery. Control: usual care
Outcomes	Participants’outcomes of interest for this review Depressive symptoms – EPDS Distress/PTSD symptoms – Parenting Stress Index (PSI) Carers’ outcomes of interest for this review Nil Economic outcomes Nil Time points: baseline, post‐intervention (< 1 month, 1‐6 months)
Notes	Source of funding: deputy of Research and Technology of Alborz University of Medical Sciences for financial support Notes on validation of instruments (screening and outcomes): for PSI Form: in Iran, the reliability of this instrument was obtained as 0.84 through test re‐test and internal consistency coefficient for total stress, and the alpha value for total stress index was 0.90. For EPDS: the reliability of the Iranian version of this instrument was determined through test re‐test (0.8), and the Cronbach’s alpha value was 0.77. Additional information: none Handling the data: not applicable Prospective trial registration number: Iranian Clinical Trial Center (IRCT20150119020719N10)