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This study examined whether the role of maternal folate in childhood asthma differs by maternal asthma history and whether there is an interaction between the two factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This study included 1948 mother\u2013child dyads from the Boston Birth Cohort. Childhood asthma was defined based on physician diagnosis documented in electronic medical records, and maternal asthma was based on standard questionnaire interview. Maternal plasma folate level within a few days of delivery was measured by chemiluminescent immunoassay. Logistic regression models were applied to examine individual and joint associations of maternal asthma history and plasma folate level with childhood asthma, adjusting for other covariables.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>When stratified by maternal asthma history, an L\u2010shaped relationship between maternal folate level and child asthma was observed in children born to mothers with asthma history (<jats:italic>p<\/jats:italic><jats:sub>interaction<\/jats:sub>\u2009=\u20090.03). The highest risk was found in children having maternal asthma history and low maternal folate level (odds ratio\u2009=\u20095.93; 95% confidence interval: 2.86\u201312.3) compared with children without maternal asthma history and with sufficient maternal folate levels. Sensitivity analyses using different definitions of asthma and stratified by major covariables yielded similar findings.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In this US prospective high\u2010risk birth cohort, maternal asthma history and low folate level interactively increased the risk of child asthma. If further confirmed, optimizing maternal folate levels during pregnancy may mitigate child asthma risk in the setting of maternal asthma history.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ppul.25680","type":"journal-article","created":{"date-parts":[[2021,10,6]],"date-time":"2021-10-06T21:40:00Z","timestamp":1633556400000},"page":"3728-3736","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Interaction of maternal asthma history and plasma folate levels on child asthma risk in the Boston Birth Cohort"],"prefix":"10.1002","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6573-7519","authenticated-orcid":false,"given":"You","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Epidemiology Johns Hopkins University Bloomberg School of Public Health  Baltimore Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiumei","family":"Hong","sequence":"additional","affiliation":[{"name":"Department of Population, Family and Reproductive Health, Center on Early Life Origins of Disease Johns Hopkins University Bloomberg School of Public Health  Baltimore Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tsung\u2010Chieh","family":"Yao","sequence":"additional","affiliation":[{"name":"Division of Allergy, Asthma, and Rheumatology, Department of Pediatrics Chang Gung Memorial Hospital and Chang Gung University College of Medicine  Taoyuan Taiwan"},{"name":"Community Medicine Research Center Chang Gung Memorial Hospital at Keelung  Keelung Taiwan"},{"name":"Chang Gung Immunology Consortium Chang Gung Memorial Hospital and Chang Gung University College of Medicine  Taoyuan Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hui\u2010Ju","family":"Tsai","sequence":"additional","affiliation":[{"name":"Department of Population, Family and Reproductive Health, Center on Early Life Origins of Disease Johns Hopkins University Bloomberg School of Public Health  Baltimore Maryland USA"},{"name":"Institute of Population Health Sciences, National Health Research Institutes  Zhunan Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaobin","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Population, Family and Reproductive Health, Center on Early Life Origins of Disease Johns Hopkins University Bloomberg School of Public Health  Baltimore Maryland USA"},{"name":"Department of Pediatrics Johns Hopkins University School of Medicine  Baltimore Maryland USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,10,4]]},"reference":[{"key":"e_1_2_10_2_1","unstructured":"Asthma. 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