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Questionnaires at previous follow\u2010ups at ages 2\u20133, 5\u20136 and 8\u2009years included information on type of housing, time outdoors, screen time and hours of reading. Myopia prevalence and associations with potential risk factors were analysed in univariate and multivariate regression models with Bonferroni's correction of <jats:italic>p<\/jats:italic>\u2010values.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In the ABIS Swedish birth cohort of young adults, the prevalence of myopia was 29%. A univariate logistic regression showed a higher odds ratio for myopia with female gender (OR 1.59; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) and a completed and started university education (OR 1.52; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Significantly lower odds ratios were found for hours spent outdoors at 8\u2009years of age (OR 0.82; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Multivariate logistic regression showed a higher odds ratio for myopia in females (OR 1.52\u20131.57; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) and completed and started university education (OR 1.34\u20131.49; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) in all models. In a model including accommodative effort, measured in diopter hours at 8\u2009years of age, hours spent outdoors were associated with a lower odds ratio for myopia (OR 0.86; <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). No association could be detected between myopia and the type of housing or near work.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The prevalence of myopia among young adults in a Swedish birth cohort was lower or unchanged compared to previous data. Female gender, higher education and less time spent outdoors in childhood were associated with an increased risk of developing myopia. Recommendations from child health services and schools should be given to stimulate children to spend enough time outdoors.<\/jats:p><\/jats:sec>","DOI":"10.1111\/aos.16688","type":"journal-article","created":{"date-parts":[[2024,4,9]],"date-time":"2024-04-09T09:41:25Z","timestamp":1712655685000},"page":"171-176","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Time spent outdoors in childhood related to myopia among young adults in the Swedish ABIS cohort"],"prefix":"10.1111","volume":"103","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0185-4326","authenticated-orcid":false,"given":"Tomas","family":"Bro","sequence":"first","affiliation":[{"name":"Department of Biomedical and Clinical Sciences Link\u00f6ping University  Link\u00f6ping Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1695-5234","authenticated-orcid":false,"given":"Johnny","family":"Ludvigsson","sequence":"additional","affiliation":[{"name":"Division of Pediatrics, Department of Biomedical and Clinical Sciences Link\u00f6ping University  Link\u00f6ping Sweden"},{"name":"Center of Paediatrics and Gynaecology and Obstetrics, H.K.H. 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