Aims:The aim of the present study was to analyse trends in full breastfeeding for at least 4 months across socioeconomic position in Denmark over a 17-year-long period from 2002 to 2019 using parental education as the indicator of socioeconomic position.Methods:The study used data on full breastfeeding collected between 2002 and 2019 by community health nurses in the collaboration Child Health Database, n=143,075. Data were linked with five categories of parental education from population registers. Social inequality was calculated as both the relative (odds ratio) and absolute social inequality (slope index of inequality). A trend test was conducted to assess changes in social inequality over time.Results:A social gradient in full breastfeeding was found for the entire study period. The odds ratio for not being fully breastfed for at least 4 months ranged from 3.30 (95% confidence interval 2.83–3.84) to 5.09 (95% confidence interval 4.28–6.06) during the study period for infants of parents with the lowest level of education (primary school) compared with infants of parents with the highest level of education (5+ years of university education). The slope index of inequality was between −38.86 and −48.81 during the entire study period, P=0.80. This indicated that both the relative and absolute social inequality in full breastfeeding to at least 4 months of age was unchanged in the study period from 2002 to 2019.Conclusions:This study showed a persistent relative and absolute social inequality in full breastfeeding for at least 4 months from 2002 to 2019 in Denmark.

中文翻译：

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2002-2019年丹麦母乳喂养时间方面的社会不平等趋势

目的：本研究的目的是使用父母教育程度作为社会经济地位的指标，分析 2002 年至 2019 年 17 年间丹麦不同社会经济地位的全母乳喂养至少 4 个月的趋势。研究使用了社区卫生护士在儿童健康合作数据库中收集的 2002 年至 2019 年间的全母乳喂养数据，n=143,075。数据与人口登记册中的五类家长教育相关。社会不平等被计算为相对（优势比）和绝对社会不平等（不平等斜率指数）。进行了趋势测试，以评估社会不平等随时间的变化。结果：在整个研究期间发现了全母乳喂养的社会梯度。研究期间，父母教育水平最低的婴儿未完全母乳喂养至少 4 个月的优势比范围为 3.30（95% 置信区间 2.83-3.84）至 5.09（95% 置信区间 4.28-6.06） （小学）与受教育程度最高（5年以上大学教育）父母的婴儿进行比较。整个研究期间不平等的斜率指数在-38.86至-48.81之间，P=0.80。这表明，在2002年至2019年的研究期间，完全母乳喂养至至少4个月龄的相对和绝对社会不平等没有变化。结论：这项研究表明，在至少4个月的时间里，完全母乳喂养的相对和绝对社会不平等持续存在。丹麦从 2002 年到 2019 年的几个月。