Higher antioxidant and lower cadmium concentrations and lower incidence of
pesticide residues in organically grown crops: a systematic literature review and meta-analyses

doi:10.1017/S0007114514001366

PMC full text:

Br J Nutr. 2014 Sep 14; 112(5): 794–811.

Published online 2014 Jul 15. doi: 10.1017/S0007114514001366

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The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution licence http://creativecommons.org/licenses/by/3.0/

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Fig. 1

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Summary of the search and selection protocols used to identify papers included in the meta-analyses. * Review carried out by one reviewer; † Data extraction carried out by two reviewers. CF, comparison of matched farms; BS, basket studies; EX, controlled field experiments.