glyphosate meta-analysis and non-Hodgkin lymphoma glyphosate meta-analysis Does Glyphosate cause non-Hodgkin lymphoma (NHL)? Observing that different studies in herbicide application workers give very different results, the authors of a recent[1] meta-analysis have proposed a new approach. By choosing those results which correspond with the highest exposure in each study, and ignoring all the rest, it might be possible to detect a causal association, if there is one. It being self-evident that the meta-risk ratio by itself would have no meaning, unless the high exposures were very similar, the main task is to show that the meta-risk ratio is statistically significant. Significance would suggest that a causal association was possible, even if no-one could tell how strong the association was. Significance testing in the biological sciences centres on whether or not the 95% confidence interval (95% CI) includes 1.0. This is a convention, not universally agreed with. In the recent paper th