Fig. 5.

Results of the standard weighted meta-analysis comparing ln OR for the frequency of occurrence of pesticide residues (percentage of positive samples) in organic and conventional crops. A mixed-effect model with crop/product group as a moderator was used. OR, ln OR for each product group (◆); ORG, organic food samples; CONV, conventional food samples; n, number of data points included in the meta-analyses. Values are odds ratios, with 95 % confidence intervals represented by horizontal bars. * P value < 0·05 indicates a significant difference between ORG and CONV. † Crops/product groups for which n≤ 3 were removed from the plots. ‡ Compound foods.