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Hypomineralised enamel defects were recorded according to the European Academy of Paediatric Dentistry criteria for MIH. Information on health and medications used during pregnancy and in the child's first 3\u00a0years of life was obtained from a questionnaire administered to parents. The overall prevalence of MIH was 28.2%, with no gender difference. A higher prevalence of MIH was found in children who had been ill or had used medication in early life and in those whose mother had been ill during pregnancy. No association was found between MIH and prematurity or maternal use of medication during pregnancy. The multivariable analyses showed that children with MIH were more likely to have suffered from illness in early life (OR\u00a0=\u00a01.41, 95% CI: 1.17\u20131.70), used antibiotics during the first year of life (OR\u00a0=\u00a01.68, 95% CI: 1.19\u20132.35), experienced tooth pain (OR\u00a0=\u00a01.33, 95% CI: 1.03\u20131.72), and experienced pain while toothbrushing (OR\u00a0=\u00a02.17, 95% CI: 1.46\u20133.23) than children without MIH. The prevalence of MIH was high in the children participating in this study.<\/jats:p>","DOI":"10.1111\/eos.12930","type":"journal-article","created":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T10:29:38Z","timestamp":1680776978000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Molar\u2013incisor hypomineralisation in Norwegian children: Prevalence and associated factors"],"prefix":"10.1111","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3786-5871","authenticated-orcid":false,"given":"Sadaf","family":"Haque Afzal","sequence":"first","affiliation":[{"name":"Department of Paediatric Dentistry and Behavioural Science, Institute of Clinical Dentistry University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4082-6520","authenticated-orcid":false,"given":"Tove Irene","family":"Wigen","sequence":"additional","affiliation":[{"name":"Department of Paediatric Dentistry and Behavioural Science, Institute of Clinical Dentistry University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8106-2956","authenticated-orcid":false,"given":"Anne Berit","family":"Skaare","sequence":"additional","affiliation":[{"name":"Department of Paediatric Dentistry and Behavioural Science, Institute of Clinical Dentistry University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3362-3015","authenticated-orcid":false,"given":"Ingvild Johnsen","family":"Brusevold","sequence":"additional","affiliation":[{"name":"Department of Paediatric Dentistry and Behavioural Science, Institute of Clinical Dentistry University of Oslo  Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,4,6]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-021-00668-5"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-015-0216-6"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-021-00649-8"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00784-018-2479-x"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.3389\/fphys.2020.579015"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016351003752395"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.0960-7439.2001.00318.x"},{"key":"e_1_2_8_9_1","first-page":"211","article-title":"molar incisor hypomineralization\u2010an emerging burden: a short study on prevalence and clinical characteristics in Central Delhi, India","volume":"12","author":"Goswami M","year":"2019","journal-title":"Int J Clin Pediatr"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.18535\/ijmsci\/v5i3.01"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdent.2017.12.002"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0722.2011.00792.x"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1080\/00016350801926941"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016357.2014.931459"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jdsr.2021.05.001"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/cdoe.12467"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-021-00646-x"},{"key":"e_1_2_8_18_1","first-page":"57","article-title":"Aetiology of severe demarcated enamel opacities \u2010 an evaluation based on prospective medical and social data from 17,000 children","volume":"35","author":"Fagrell T","year":"2011","journal-title":"Swed Dent J"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1177\/0022034514561657"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-022-00712-y"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-263X.2007.00908.x"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40368-021-00631-4"},{"key":"e_1_2_8_23_1","unstructured":"Statistics Norway. 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