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. 2018 Apr 15;15(4):759. doi: 10.3390/ijerph15040759

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© 2018 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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Occupation and CRP Levels. * Significant difference between Agriculture, Forestry, Fishing and Arts, Entertainment, and Recreation; + Significant difference between construction and Professional, Scientific and Technical services; # Significant difference between construction and Arts, Entertainment, and Recreation.