Therefore, for the review's four primary outcomes we carried out subgroup analysis to explore the impact of interventions involving different types of supporter (professional
versus lay person, or both); types of support (face - to - face
versus telephone support or both); timing of support (antenatal and postnatal
versus postnatal alone); whether the support was proactive (scheduled
contacts) or reactive (women needed to request support); and whether support interventions had similar effects in settings with different background breastfeeding initiation rates (low, medium or high background rates).