Abstract
Given the growing global trend of multiple sclerosis (MS), this study was designed to evaluate environmental determinates of the worldwide distribution of MS in the presence of socioeconomic and geographic indices. MS data was obtained from the Institute for Health Metrics and Evaluation website. The air pollution parameters, including particles with aerodynamic diameter less than 2.5 μm (PM2.5), tropospheric ozone, and solid fuel use, were acquired from global burden of disease resources and the World Health Organization. Ultraviolet index (UVI) values were obtained from the Tropospheric Emission Monitoring Internet Service website. Correlation and linear regression analyses were used to investigate the relationship between air pollution and environmental parameters with MS variables. The average prevalence and incidence rates in countries with high UVI were 5.17 and 0.25 per 100,000, respectively, and in countries with low UVI were 101.37 and 0.78, respectively. The results showed negative associations between prevalence, incidence and mortality of MS with ozone concentrations (β = − 1.04, − 0.04, and − 0.01 respectively; P < 0.01). Also, the fully adjusted model showed significant negative correlation of UVI with the MS variables in the presence of other variables (P < 0.01). Our findings demonstrated that UVI had the strongest significant inverse association with MS distribution. Consequently, vitamin D intake may be a major contributor to MS development. However, this study showed a slight influence of air pollution on the prevalence of MS in the presence of other parameters. Given the inconsistent results of previous studies, further studies may be required.
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Data availability
All data generated or analyzed during this study are included in this published article [and its supplementary information file].
Abbreviations
- CNS:
-
central nervous system
- DALY:
-
disability-adjusted life year
- GBD:
-
Global Burden of Disease
- HDI:
-
Human Development Index
- MS:
-
multiple sclerosis
- SDI:
-
socio-demographic index
- PM:
-
particle matter
- UVI:
-
ultraviolet index
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Acknowledgments
The authors would like to thank Torbat Heydariyeh University of Medical Sciences for their financial support for performing this research and Dr. Maryam Foroghi for her comments.
Funding
This work was supported by the Torbat Heydariyeh University of Medical Sciences [grant numbers: A-10-1311-13].
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Vahid Kazemi Moghadam: conceptualization, methodology, data curation, formal analysis, writing—original draft preparation, writing—review and editing. Aisha S. Dickerson: methodology, data curation, formal analysis, writing—original draft, writing—review and editing. Fateme Shahedi: conceptualization, data curation, writing—original draft preparation. Edris bazrafshan: conceptualization, data curation, writing—review and editing. Seyedeh Nahid Seyedhasani: methodology, data curation, writing—review and editing. Mohammad Sarmadi: conceptualization, methodology, data curation, formal analysis, writing—original draft preparation, writing—review and editing, supervision, funding acquisition. All authors read and approved the manuscript.
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The study was approved by the Ethics Committee of Torbat Heydariyeh University of Medical Sciences (Ethical code: IR.THUMS.REC.1397.027).
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Kazemi Moghadam, V., Dickerson, A.S., Shahedi, F. et al. Association of the global distribution of multiple sclerosis with ultraviolet radiation and air pollution: an ecological study based on GBD data. Environ Sci Pollut Res 28, 17802–17811 (2021). https://doi.org/10.1007/s11356-020-11761-5
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DOI: https://doi.org/10.1007/s11356-020-11761-5