Response rates
Overall, 259 women were recruited in Phase 1 and 361 in Phase 2. Response rates to the antenatal component were over 80 per cent in each phase, as Table 1 shows. Despite some attrition at the postnatal stage, the overall response rates were about two-thirds of the women originally recruited. In Phase 1, there were nine informants who had booked for home birth or birth in other hospitals and there were 11 in Phase 2. These women were excluded from the analysis.