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This paper introduces the MAS 3 cohort, which consists of data collected from the participants in the prospective Pune Maternal Nutrition Study from the antenatal period to children at 18 years of age (1996\u20132014) in the Maharashtra state, India.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Participants<\/jats:title>\n                    <jats:p>Recruitment of 2466 married non-pregnant women, and their husbands, took place between June 1994 and April 1996 in six villages, approximately 50\u2009km from Pune city in India. Women were followed up monthly to identify those who became pregnant. A total of 797 pregnant women were followed up for data collection at or near gestational week 18 and 28, with further data collection for women and children occurring within 72 hours of delivery, for both live and stillbirths. Of the 797\u2009women, 710 were included in the MAS 3 cohort, and long-term follow-up of children occurred at 6 years, 12 years and 18 years of age.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Findings to date<\/jats:title>\n                    <jats:p>In the MAS 3 cohort, most mothers (73%) were aged between 18 and 25 years at the time of their final prepregnancy visit (baseline), and half (55%) belonged to families of middle-upper socioeconomic status (SES). At the children\u2019s baseline (birth) visit, children had a mean birth weight of 2630\u2009g (SD: 376), with one third (31%) of low birth weight. At the 6-year, 12-year and 18-year follow-up visits, data were available for 706 (99%), 689 (97%) and 694 (98%) children.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Future plans<\/jats:title>\n                    <jats:p>MAS 3 will be used to address a number of research objectives, including (1) Trends of haemoglobin and anaemia-related micronutrients from age 6 to 18 years, (2) Micronutrient causes of anaemia during childhood, (3) Prevalence and risk factors for maternal anaemia and childhood anaemia, (4) Impact of maternal anaemia on immediate birth outcomes and (5) Intergenerational risk factors associated with anaemia.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2025-104184","type":"journal-article","created":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T18:26:56Z","timestamp":1761676016000},"page":"e104184","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Cohort profile: the Maharashtra Anaemia Study 3 (MAS 3)\u2014a maternal-child cohort study up to age 18 years in India"],"prefix":"10.1136","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1908-2742","authenticated-orcid":false,"given":"Melissa T","family":"Benavente","sequence":"first","affiliation":[{"name":"Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nophar","family":"Geifman","sequence":"additional","affiliation":[{"name":"Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah C","family":"Bath","sequence":"additional","affiliation":[{"name":"Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kourosh R","family":"Ahmadi","sequence":"additional","affiliation":[{"name":"Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9426-977X","authenticated-orcid":false,"given":"Andrew W","family":"Fogarty","sequence":"additional","affiliation":[{"name":"Lifespan and Population Health Unit, School of Medicine, University of Nottingham, Nottingham, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charles","family":"Marshall","sequence":"additional","affiliation":[{"name":"Wolfson Institute of Population Health, Queen Mary University of London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sumantra","family":"Ray","sequence":"additional","affiliation":[{"name":"NNEdPro Global Institute for Food, Nutrition and Health, St John\u2019s Innovation Centre, Cambridge, UK"},{"name":"School of Biomedical Sciences, Ulster University, Coleraine, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laila J","family":"Tata","sequence":"additional","affiliation":[{"name":"Lifespan and Population Health Unit, School of Medicine, University of Nottingham, Nottingham, UK"},{"name":"Centre for Perinatal Research, University of Nottingham, Nottingham, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2911-2378","authenticated-orcid":false,"given":"Chittaranjan","family":"Yajnik","sequence":"additional","affiliation":[{"name":"Diabetes Unit, King Edward Memorial Hospital Research Centre, Pune, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anand","family":"Ahankari","sequence":"additional","affiliation":[{"name":"Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK"},{"name":"Faculty of Health, Psychology and Social Care, Manchester Metropolitan University, Manchester, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,10,28]]},"reference":[{"key":"2025120415083827000_15.10.e104184.1","doi-asserted-by":"crossref","DOI":"10.1001\/jamanetworkopen.2022.44772","article-title":"Association of Maternal and Child Anemia With Brain Structure in Early Life in South Africa","volume":"5","author":"Wedderburn","year":"2022","journal-title":"JAMA Netw Open"},{"key":"2025120415083827000_15.10.e104184.2","unstructured":"International Institute for Population Sciences (IIPS) and ICF . 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