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Previous exposure (6\u2009years prior to enrollment) to different wavelengths of ambient UVs were obtained from public repositories by linking to individual hometown addresses. Logistic models were applied to assess the relationship between ambient UV exposure and acne. Subgroup analysis was conducted by sun protection behaviors and time of daily sun exposure. Overall effect and single effect of exposure to four different wavelengths of UVs (305, 310, 324, and 380\u2009nm) were estimated by Bayesian kernel machine regression (BKMR).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 19,939 participants was included for analysis. Analysis in all participants showed a significant association between log\u2010transformation levels of exposure to UV at 305\u2009nm (log (UV 305\u2009nm)) and acne (OR\u00a0=\u00a00.77, <jats:italic>p<\/jats:italic>\u00a0=\u00a0.021). The effect size was stronger in participants reporting no sun protection habit. Both UVs at 305\u2009nm (OR\u00a0=\u00a00.51, <jats:italic>p<\/jats:italic>\u00a0=\u00a0.001) and 310\u2009nm (OR\u00a0=\u00a00.50, <jats:italic>p<\/jats:italic>\u00a0=\u00a0.012) were associated a decreased risk of acne in participants reporting no sun protection habit. This inverse association was also observed in those exposed to low levels of UV (&lt;1\u2009h\/day). The BKMR indicated consistent results that low levels of exposure to UVs combination and UVs at 305 and 310\u2009nm were associated with a lower risk of acne.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Long\u2010term exposure to relatively low levels of ambient UVB are associated with a decreased risk of moderate\u2010to\u2010severe acne in college students.<\/jats:p><\/jats:sec>","DOI":"10.1111\/phpp.12852","type":"journal-article","created":{"date-parts":[[2022,12,22]],"date-time":"2022-12-22T07:20:40Z","timestamp":1671693640000},"page":"132-139","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Long\u2010term exposure to low levels of ambient <scp>UVB<\/scp> are associated with a decreased risk of moderate\u2010to\u2010severe acne: A\u00a0retrospective cohort study in college students"],"prefix":"10.1111","volume":"39","author":[{"given":"Peng","family":"Chen","sequence":"first","affiliation":[{"name":"Department of Dermatology, Xiangya Hospital Central South University  Changsha China"},{"name":"Hunan Key Laboratory of Aging Biology, Xiangya Hospital Central South University  Changsha China"},{"name":"National Clinical Research Center for Geriatric Disorders, Xiangya Hospital Central South University  Changsha China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shenxin","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Surveying and Remote Sensing Science, School of Geosciences and Info\u2010physics Central South University  Changsha China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yi","family":"Xiao","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Xiangya Hospital Central South University  Changsha 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