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We analysed the contribution of various environmental factors to the risk of developing MS from a population perspective.<\/jats:p><\/jats:sec><jats:sec id=\"S0317167100011124_abs2\"><jats:title>Methods:<\/jats:title><jats:p>We collated global data of MS prevalence from 54 studies over the previous ten years and calculated the degree of risk contributed by latitude, longitude, ultraviolet radiation (from NASA satellite data and formulae for available sunlight hours), population smoking rates (from WHO data), gender, study date, study demographics, and several socioeconomic factors. We report a very significant negative correlation between MS prevalence and available ultraviolet (UV) radiation.<\/jats:p><\/jats:sec><jats:sec id=\"S0317167100011124_abs3\"><jats:title>Results:<\/jats:title><jats:p>The lack of available UV radiation outweighs other factors by at least 20 fold (p&lt;10\u2227-8) from single variate regression analysis. Multiple regression analysis revealed that latitude and longitude are also significant factors; smoking may also provide a very minimal role. The eight prevalence studies from Scandinavia produced prevalences that were lower than expected, given their global geospatial positioning.<\/jats:p><\/jats:sec><jats:sec id=\"S0317167100011124_abs4\"><jats:title>Conclusions:<\/jats:title><jats:p>The available ultraviolet radiation is a significant environmental factor, moreso than all the other factors examined.<\/jats:p><\/jats:sec>","DOI":"10.1017\/s0317167100011124","type":"journal-article","created":{"date-parts":[[2014,12,12]],"date-time":"2014-12-12T15:09:59Z","timestamp":1418396999000},"page":"98-105","source":"Crossref","is-referenced-by-count":50,"title":["A Quantitative Analysis of Suspected Environmental Causes of MS"],"prefix":"10.1017","volume":"38","author":[{"given":"Scott","family":"Sloka","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Silva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Pryse-Phillips","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Scott","family":"Patten","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luanne","family":"Metz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"V. 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