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. 2017 Jan 11;14(1):63. doi: 10.3390/ijerph14010063

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© 2017 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Nonlinear curve fits of MTHFR C677T Polymorphism TT (left) and CT (right) genotypes of control and Alzheimer’s disease (AD) groups with annual death rates from air pollution (AP death) per million population (Levels: 2 = 50–100 deaths/million, 3 = 100–250 deaths, 4 = 250–400+ deaths). Note: TT%7ct: Percentage of MTHFR C677T TT genotype in control group; TT%7ca: Percentage of MTHFR C677T TT genotype in AD group; CT%7ct: Percentage of MTHFR C677T CT genotype in control group; CT%7ca: Percentage of MTHFR C677T CT genotype in AD group.