Table 1 Databases searched, and inclusion and exclusion criteria

British Nursing Index

Cochrane Database of Systematic Reviews

Cochrane Central Register of Controlled Trials (CENTRAL)

CINAHL Plus

ClinicalTrials.gov

Science Citation Index Expanded (SCI-EXPANDED)

Social Sciences Citation Index (SSCI)

Conference Proceedings Citation Index- Science (CPCI-S)

Conference Proceedings Citation Index- Social Science & Humanities (CPCI-SSH)

Database of Abstracts of Reviews of Effects (DARE)

Econlit

Embase

Health Technology Assessment (HTA) Database

International Clinical Trials Registry Platform (ICTRP)

Maternity and Infant Care

MEDLINE In-Process & Other Non-Indexed Citations and MEDLINE

POPLINE

PsycINFO

NHS Economic Evaluation Database (EED)

HEED: Health Economic Evaluations Database

• Study design: RCTs and reviews of RCTs, with meta-analysis

• Population: pregnant women receiving antenatal care, +/- family or people delivering such care

• Intervention: any model offering a defined package of antenatal care, which might be delivered by professional staff or peer/non-professional supporter

• Outcome(s): maternal/infant perinatal outcomes; maternal psychosocial outcomes; organisational outcomes, including economic evaluations; maternal health behaviour outcomes

• Reviews of mixed methods studies, where the results of any RCTs were not clearly identifiable from other results and/or they did not contain a meta-analysis (and therefore did not add to original papers)

• Interventions only offered during labour and/or the postnatal period

• Stated outcomes were not relevant to pregnancy, birth or the period following birth (further defined as up to 2 years following birth)

• The main area of interest or outcome related specifically to child abuse

• An English language version was not available (due to translation and resource limitations)