Supplementary Information and Dataset for the Manuscript (Determinants of prenatal breastfeeding knowledge, attitudes, and self-efficacy among Burmese migrant pregnant mothers in Samut Sakhon Province, Thailand: a cross-sectional study)

<b>Objective: The study aimed to </b>explore the determinants of prenatal breastfeeding knowledge, attitudes, and self-efficacy among Burmese migrant pregnant mothers in Samut Sakhon Province, Thailand.<b>Design: </b>The data were collected as part of a baseline survey of a randomized controlled trial.<b>Setting and participants:</b> A total of 198 Burmese migrant mothers between 28^th and 34^th weeks of gestation were recruited from the antenatal care clinic of Samut Sakhon Hospital.<b>Primary outcome measures:</b> Breastfeeding knowledge, attitudes, and self-efficacy<b>Results: </b>The prevalence of good breastfeeding knowledge was 65.7%, positive attitudes towards breastfeeding was 55.1%, and high breastfeeding self-efficacy was 70.7%. Multivariate logistic regression models revealed that mothers aged above 25 years (AOR=3.10, 95%CI: 1.21–7.94), being Bamar (AOR=2.33, 95%CI: 1.22–4.44), having support from husband (AOR=2.34, 95%CI: 1.20–4.58), and having previous childbirth experience (AOR=2.46, 95%CI: 1.26–4.81) were the main determinants of good breastfeeding knowledge. Similarly, being Bamar (AOR=2.82, 95%CI: 1.51–5.25), having high school education (AOR=4.27, 95%CI: 1.80–10.09), and having access to workplace breastfeeding support (AOR=5.32, 95%CI: 1.41–20.07) were found to be significant predictors of positive attitudes towards breastfeeding. Moreover, mothers aged above 25 years (AOR=2.89, 95%CI: 1.07–7.84), being Bamar (AOR=2.42, 95%CI: 1.15-5.09), being unemployed (AOR=7.75, 95%CI: 1.89–31.86), having support of husband (AOR=3.20, 95%CI: 1.46–7.03), having previous breastfeeding experience for six months or more (AOR=4.97, 95%CI: 2.12–11.65), and having intention to exclusively breastfeed (AOR=2.70, 95%CI: 1.25–5.83) had significant associations with high breastfeeding self-efficacy.<b>Conclusion: </b>The prenatal breastfeeding knowledge, attitudes and self-efficacy among Burmese migrant mothers were influenced by many factors. A comprehensive understanding of these factors will enable policymakers and healthcare providers to develop context-specific interventions for the promotion of exclusive breastfeeding among Burmese migrant mothers in Thailand.

**研究目的：** 本研究旨在探讨泰国沙没沙空府缅甸移民孕妇的产前母乳喂养知识、态度及自我效能感的影响因素。
**研究设计：** 本研究数据采集自一项随机对照试验（Randomized Controlled Trial）的基线调查阶段。
**研究场景与研究对象：** 从沙没沙空医院产前保健门诊招募妊娠28~34周的缅甸移民孕妇共198名。
**主要结局指标：** 母乳喂养知识、态度及自我效能感。
**研究结果：** 具备良好母乳喂养知识的受试者占比为65.7%，对母乳喂养持积极态度者占55.1%，拥有高母乳喂养自我效能感者占70.7%。多因素logistic回归模型分析结果显示，年龄≥25岁（调整后优势比（Adjusted Odds Ratio, AOR）=3.10，95%置信区间（95% Confidence Interval, 95%CI）：1.21~7.94）、为缅族（Bamar，AOR=2.33，95%CI：1.22~4.44）、获得丈夫支持（AOR=2.34，95%CI：1.20~4.58）以及有既往分娩史（AOR=2.46，95%CI：1.26~4.81）是良好母乳喂养知识的主要影响因素。同样，缅族身份（AOR=2.82，95%CI：1.51~5.25）、高中学历（AOR=4.27，95%CI：1.80~10.09）以及可获得职场母乳喂养支持（AOR=5.32，95%CI：1.41~20.07）是母乳喂养积极态度的显著预测因素。此外，年龄≥25岁（AOR=2.89，95%CI：1.07~7.84）、缅族身份（AOR=2.42，95%CI：1.15~5.09）、无业状态（AOR=7.75，95%CI：1.89~31.86）、获得丈夫支持（AOR=3.20，95%CI：1.46~7.03）、既往有≥6个月的母乳喂养经验（AOR=4.97，95%CI：2.12~11.65）以及具备纯母乳喂养意向（AOR=2.70，95%CI：1.25~5.83）均与高母乳喂养自我效能感存在显著关联。
**研究结论：** 泰国缅甸移民孕妇的产前母乳喂养知识、态度及自我效能感受多种因素影响。全面理解这些影响因素，可帮助政策制定者与医疗保健服务提供者制定针对当地场景的专属干预方案，以促进泰国境内缅甸移民群体的纯母乳喂养工作。