The follow-up post-partum survey was an online self-administered structured questionnaire used to collect quantitative and qualitative data (S2 and S3 Files). The post-partum instrument contained questions about labor and childbirth experience, use of EBP during childbirth, obstetric violence, breastfeeding, and memory of the educational intervention. The survey was linked to the post-intervention instrument to assess socioeconomic, demographic, and perceived knowledge information. Four groups of variables were selected for the quantitative analysis in this study:

Socio-demographic characteristics. Age, race, education, private health insurance, and income.

Obstetric characteristics. First pregnancy, type of hospital, type of birth, perceived ability to have a normal birth.

Perceived Knowledge. The perceived knowledge variables were grouped into three different domains, based on the results of factor analysis of a previous study [41]. The domains are: 1) EBP Knowledge, 2) Normal Birth Knowledge, and 3) Cesarean Knowledge. For each knowledge domain, a mean score before the intervention (based on recall) and a mean score after the intervention were computed from the sum of all variables in that domain, ranging from 1 to 5 points [41]. A specific change score was calculated for each domain, representing the women’s perceived variation of knowledge using the difference between the mean after and the mean before, ranging from -5 to 5 [41]. Women who did not perceive an increase in knowledge after the intervention ranked within -5 and 0. Women who perceived knowledge increase after the intervention ranked between 0.1 and 5 [41].

Use of Intrapartum EBP. Participants were asked whether or not they used each of the evidence-based practices during labor and delivery: birth plan; companionship during childbirth; doula support; midwife care; freedom of mobility during labor; choice of position during delivery; use of non-pharmacological methods for pain relief.

Further information describing the variables used, local context, and variable preparation can be found in S4 File.

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