Response rate
In total, 2,446 out of 7,992 (30.6%) women responded in the paper survey and 2,165 out of 7,980 (27.1%) women responded in the push-to-web survey (Fig. Number and proportion of overall, postal and online responses across the three surveysIn total, 1,316 women (who were living in England) responded in the social media survey (1,622 including those women living in Northern Ireland, Scotland and Wales). The total number of births in England during the data collection period was 292,598, and so the nominal response rate in the social media survey was 0.4% (1,316 out of 292,598). In the following analyses, the social media survey only includes those women who were living in England at the time of survey participation.