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A strong association was observed between several risk factors \u2013 family history, age, BMI and skin type \u2013 and acne presentation or severity in multiple studies. The pooled odds ratio of 2.36 (95% CI 1.97\u20132.83) for overweight\/obese BMI with reference to normal\/underweight BMI and the pooled odds ratio of 2.91 (95% CI 2.58\u20133.28) for family history in parents with reference to no family history in parents demonstrate this strong association. In addition, a pooled odds ratio of 1.07 (95% CI 0.42\u20132.71) was obtained for sex (males with reference to females). However, the association between other factors, such as dietary factors and smoking, and acne presentation or severity was less clear, with inconsistent results between studies. Thus, further research is required to understand how these factors may influence the development and severity of acne. This study summarizes the potential factors that may affect the risk of acne presentation or severe acne and can help researchers and clinicians to understand the epidemiology of acne and severe acne. Furthermore, the findings can direct future acne research, with the hope of gaining insight into the pathophysiology of acne so as to develop effective acne treatments.<\/jats:p>","DOI":"10.1038\/s41598-020-62715-3","type":"journal-article","created":{"date-parts":[[2020,4,1]],"date-time":"2020-04-01T06:03:09Z","timestamp":1585720989000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":396,"title":["Systematic review of the epidemiology of acne vulgaris"],"prefix":"10.1038","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0811-841X","authenticated-orcid":false,"given":"Anna Hwee Sing","family":"Heng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1337-5146","authenticated-orcid":false,"given":"Fook Tim","family":"Chew","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,4,1]]},"reference":[{"issue":"9859","key":"62715_CR1","doi-asserted-by":"publisher","first-page":"2163","DOI":"10.1016\/s0140-6736(12)61729-2","volume":"380","author":"T Vos","year":"2012","unstructured":"Vos, T. et al. 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