Figure 7

Funnel plots of studies included in the meta-analysis for the risk of SNC associated with exposure to farming, construction and Nickel/Chromium compounds. Note: Funnel plots can be easily interpreted by including diagonal lines representing the 95% confidence limits around the pooled estimate, to show the expected distribution of studies in the absence of heterogeneity or of selection bias: in the absence of heterogeneity, 95% of the studies should lie within the funnel defined by these straight lines.